A successful Expeditionsfahrzeug requires a robust, proven and well engineered base vehicle, that is additionally straightforward to maintain and service – given that inevitably spares will be needed on occasion (particularly when visiting and operating in extreme regions), then a good global availability of such parts is also useful.
Army and emergency service vehicles offer strong advantages as base vehicles for your expedition trucks, given that by definition the required aspects of maintainability, durability and functionality are included, although dependent on the source vehicle, specialist knowledge or parts that are available in such service organisations, may not be so freely available in the civilian market.
As a result, it is no surprise that a vehicle such as a Landrover or Unimog is used so widely both in the emergency services or the expedition market. Finally, as our vehicles are sourced from Swiss/Austrian/German 'Feuerwehr' (fire brigade'), Swiss/Austrian/German 'Bundeswehr' (Army) or German 'Technische Hilfes Werk (THW)' (no British equivalent), they have had easy lives, intense and regular maintenance, and often 'over-nighted' in heated & dry buildings.
As the new price of most emergency service vehicles is very high compared to the civilian versions and/or types – there is an inevitable cost associated with extreme 4WD and off-road capability – such a price tag whilst not worrying the mid to top end of the expedition vehicle market, pressures the low to mid-end, meaning that until Gekkotruck, the choice for many people was build the vehicle themselves, or operate something smaller than required (such as a Landrover base), or even settle for a non AWD/4WD vehicle - at Gekkotruck, we renovate the underlying chassis, perform a full mechanical inspection, and include enough standard items, that you are ready for your expedition following delivery of your vehicle, along with providing the necessary TÜV (MOT/DVLA) re-registration, along with underlying certificates of correct build (primaríly gas & electrical safety, new weight empty weights, dimensions etc.).
So what about the living cabin, the box ? - with some manufacturers, their design philosophy is aimed towards a self-contained living unit that sits on the standard chassis, and they leave the choice of the chassis to the customer. With other manufacturers, they build a living cabin, often customisable, but are fairly limited towards changes/additions to the chassis.
At Gekkotruck, we see it differently. Necessarily there are compromises with every build, and the only reasonable solution is to look at the whole vehicle holistically, and then design/implement changes accordingly - we have standard model formats, which mean that we have already answered many of the design questions that usually occur - clearly, if your need is a 2 person rig, then the choice of vehicle is tremendous ( and relatively straightforward, but if your need is a 2 adult plus 4 children layout, you will struggle to find a company that listens, or that you can afford to pay to listen):
We are also happy to discuss any specific alternative chasis that you may wish to use as a basis for your vehicle.
Item | Rationale | Model 1 | Model 2 | Model 3 | Model 4 | |
Unimog 435 | Unimog 435 DOKA | Unimog 435 L37 | MAN KAT1 (Bison) | |||
Base vehicle | ||||||
1 | Wheel base (mm) | 3250 | 3250 | 3700 | various | |
2 | Engine size, power (kw with/without turbo) | 6 litre, 96/128 | 6 litre, 96/128 | 6 litre, 96/128 | various | |
3 | Turbo fitted (if not available on standard unit) | 30% increased power | Optional | Optional | Optional | n/a |
4 | Intercooler kit fitted | 25% increased torque | Optional | Optional | Optional | n/a |
5 | Torque/ (effective with lowest gearing) | |||||
6 | Gears - 4 High, 4 Low (reverse on all low gears) | √ | √ | √ | 6 | |
7 | Ground clearance (with 12.5 tyres), mm | 44 | 44 | 44 | 41 | |
8 | Maximum entry angle | 46 | 46 | 46 | ||
9 | Escape (Departure) angle | 51 | 51 | 51 | ||
10 | Maximum gradient, % | 70% | 60% | |||
11 | Maximum side slope, degrees | 42 | 42 | 42 | 40 | |
12 | Preparation for 4WD or diff locks | Switch on the move | NONE | NONE | NONE | NONE |
13 | Wading depth (Recommended, Limit) m | 1.2/1.9 | 1.2/1.9 | 1.2/1.9 | 1.2/1.9 | |
14 | Preparation before/after wading | NONE | NONE | NONE | NONE | |
15 | Off-road ability | EXTREME | EXTREME | VERY GOOD | GOOD | |
16 | Tyre pressure adjustment system | Manual | Manual | Manual | Manual | |
17 | Max speed (km/h) | 86 | 86 | 105 | 90 | |
18 | Suspension - coil spring (30 degree opposite twist) | √ | √ | √ | ||
19 | Frame twist (degrees) | 15 | 15 | 15 | RIGID | |
20 | Working of diff locks, front, back and between axles | √ | √ | √ | ||
21 | Fuel pre and main filters | √ | √ | √ | ||
22 | Larger tyres (14.5x20) | Increased ground clearance, increased speed (to 90 km/hr) | √ | √ | √ | n/a |
23 | Hi drivers cab | More comfort, increased options for living space | X | X | √ | n/a |
24 | 'Fast Axles' | Increases maximum cruise speed to 100 km/hr | X | √ | √ | n/a |
25 | Snorkel fitted (if missing) | Needed for fording greater than 1.5 meters | √ | √ | √ | n/a |
26 | Front underbody protection plate | Not fitted as standard on all Unimogs/4WD | √ | √ | √ | n/a |
27 | Uprated alternator (100 amps) | Basic requirement to avoid straining standard unit (especially when electric winch fitted) | √ | √ | √ | n/a |
28 | Second alternator (not with mechanical A/C) | Back-up in case of main unit failure | Optional | Optional | Optional | n/a |
29 | ISRI driver/co-driver mechanical sprung seats | Basic seats not so comfortable for long journeys in rough terrain | √ | √ | √ | √ |
30 | ISRI driver/co-driver air sprung seats | Additional features included, included seat heating | Optional | Optional | Optional | Optional |
31 | Truck double tone air horn | Standard unit does not differentiate size of vehicle | Optional | Optional | √ | √ |
32 | Front waist lights | Already available or easily fittable on Unimogs and many base vehicles | √ | √ | √ | X |
33 | Chasis mounted army style jerry can holders | Useful for Unimogs either as jerry can holders (for generator fuel etc.) | Optional | Optional | Optional | Optional |
34 | Custom made external storage boxes | Need to use every all possible spaces for storage | √ | √ | √ | √ |
35 | Renovated/painted chasis | Sourced vehicles of 30 years age, often with near zero rust, but increases longevity of base chasis | √ | √ | √ | √ |
36 | Trailor hitch (Ringfelder etc.) | To extend periods between supply locations and/or take additional loads | √ | √ | √ | √ |
37 | Renovated/painted drivers cab | Especially to extend internal colours into drivers cabin, as part of a general upgrading or addition of new features (12/230V converters, coolbox, etc.) | √ | √ | √ | √ |
38 | Tilt meter | Not as accurate as the 'seat of the pants', but passengers like it | Optional | Optional | Optional | Optional |
39 | Satellite navigation | Enhanced versions with off-road features and information | Optional | Optional | Optional | Optional |
40 | Searchlight | Standard issue on fire brigade and THW sourced vehicles | Optional | Optional | Optional | Optional |
Base Vehicle Additions | ||||||
41 | Tyre-wheel winch (custom, electric) | Needed, as original tyre location no longer possible, and each unit weighs typically 90 kg | √ | √ | √ | √ |
42 | 2 spare wheels | 1 insufficient for an expedition fahrzeug (3 too heavy) | √ | √ | √ | √ |
43 | Second vehicle battery (reserve start plus winch) plus custom Aluminium box enclosure | Electric winch requires | √ | √ | √ | √ |
44 | Cut-off / isolation switches to both 'vehicle' batteries (German army spec) | Additional security / back-up in case of charging and/or battery problems | √ | √ | √ | √ |
45 | Full roof rack (with branch guard) | Less than 7.5 tonne 4WD vehicles are always short of storage space - can serve as additional/alternative sleeping space on DOKA based rigs | Optional | √ | √ | √ |
46 | External roof mounted large storage locker | Optional | Optional | Optional | Optional | |
47 | Customised/adapted roof track (i.e. to support a canoe etc.) | n/a | √ | √ | n/a | |
48 | 12v on roof rack | Good for search lights /TV etc. | Optional | √ | √ | √ |
49 | Additional truck forward lighting (high mounted) | Always useful for additional lighting on difficult terrain during night driving | Optional | √ | √ | √ |
50 | Long range diesel tanks (400+ litres) | √ | √ | √ | Note 1 | |
51 | 12 tonne electric winch (front) - some model 4's may have mechanical or hydraulic rear winch from base vehicle | Optional | √ | √ | mech. | |
52 | Electric winch (rear) - some model 4's may have mechanical or hydraulic rear winch from base vehicle | Optional | Optional | Optional | n/a | |
53 | Compressed air line | Optional | Optional | Optional | ||
54 | Airline style' loading/attachment strips | Useful for temporary or near permanent attachments | √ | √ | √ | √ |
55 | Front 230v generator platform | Optional | Optional | Optional | Note 2 | |
56 | Radio/DVD/reversing display (drivers cab) | √ | √ | √ | √ | |
57 | Checkerplate Aluminium External storage boxes | √ | √ | √ | √ | |
Living space(s) | ||||||
58 | Empty cabin, Inner dimensions (WxLxH) metres | 2.15x4.3x1.9 | 2.15x4x1.9 | 2.25x3.3x1.9 | various | |
59 | Self-supporting composite wall construction of between 48 and 60 mm | std 48mm | std 48mm | std 48mm | std 48mm | |
60 | Thicker walls (60mm), standard 40mm | Insulation rating 1,5 m2 K/W (48 mm) 2,2 (60 mm) | Optional | Optional | Optional | Optional |
61 | Chunky Resin based edging/corner strengthening supplemented by aluminium checkerplate sheeting | √ | √ | √ | √ | |
62 | Frame - 3 point attachment | 3-point kinematic attachment with main and flex mounts for stress-free body coupling to the torsion elastic chassis frame | √ | √ | √ | n/a |
63 | Flexible walled tunnel with closing door | √ | √ | √ | X | |
64 | Entrance door with lowered/recessed stainless steel handle | √ | √ | √ | √ | |
65 | Hardened entrance door (with vertical bolts) | Optional | Optional | Optional | Optional | |
66 | 3 side windows, 2 roof windows and 2 access doors to storage | √ | √ | √ | √ | |
67 | High & low cupboards in kitchen, bedroom, bathroom areas with choice of colour (constructed in 8mm plywood, plus steel frames for seating) including wardrobe and choice of doors/shelves versus bins, with aluminium edging | |||||
68 | Beds with 1 double converting from sofa (choice of covering fabric) | 2+2 | 2+3 | 6 | 2 to 8 | |
69 | Safety deposit box | Optional | Optional | Optional | Optional | |
70 | Calorifier (marine spec) | Avoids need for switching on diesel unit (and waiting for water to be heated), in winter leaves diesel unit free to hit interior (a full tank available within less than 1 hour of driving), also backup in case of failure of main unit | Optional | Optional | Optional | Optional |
71 | Heating/drying radiator | Diesel heater over-powered for space, will effectively dry clothes hanging in shower compartment without radiator, but radiator off engine heating avoids need for rear unit to be on during travelling (useful re-use of available wasted energy from engine | Optional | Optional | Optional | Optional |
72 | 3 burner hob and oven (gas) | 2 hobs often inflexible - oven offers additional flexibility | √ | √ | √ | √ |
73 | 3 burner hob and oven (diesel) | Marine spec. | Optional | Optional | Optional | Optional |
74 | Large 3-way fridge (gas, 12v, 230v) | Always needed whether for a larger group and/or extended journeys | √ | √ | √ | √ |
75 | 3-way Freezer (gas, 12v, 230v) | Useful for longer trips in regions where reasonable food sources are limited | Optional | Optional | Optional | Optional |
76 | Mechanical Air Conditioning (only whilst driving) | A/C when not driving not realistic option for <7.5 tonne vehicles | Optional | Optional | Optional | Optional |
77 | 12v to 230v converter (to 2kw) | Many everyday useful items require (laptops, hair dryer), and for reasonably low wattage items is reasonable to convert from 12 volts (especially during transit) | √ | √ | √ | √ |
78 | Increase converter rating (to 5kw) | Some customers may have additional demands for 'on the move' 230V | Optional | Optional | Optional | Optional |
79 | Drivers Cab sound proofing kit | Significantly reduces noise of driving | Optional | √ | √ | X |
80 | Under bonnet sound proofing | Engine mats assist noise reduction especially in Unimog based vehicles (and when used in conjunction with sound deadoning floor an in-cab mats | Optional | Optional | √ | X |
81 | Heat insulation in drivers cab | Required mainly when cab also used as living-sleeping area (i.e. for DOKA based units | X | √ | √ | X |
82 | Additional wide angle rear view mirror | Base vehicle does not include | √ | √ | √ | √ |
83 | Kerbside mirror | Increased length and height of vehicle makes even more useful | √ | √ | √ | √ |
84 | Radio-DVD plaver | Missing in base vehicle | √ | √ | √ | √ |
85 | Reversing Camera | Useful also for 'safety' | Optional | √ | √ | √ |
86 | Custom s/steel entrance ladder | Avoids problems from contact with ground (no noise associated with movement of vehicle when parked) | √ | √ | √ | √ |
87 | Additional individual seats in rear of front cab | n/a | √ | √ | X | |
88 | Additional seat-belted seats in rear living cabin | √ | √ | √ | √ | |
89 | Painted living box (& drivers cab) | Extend colour theme from rear, use as opportunity to renovate any damage/rust spots | √ | √ | √ | √ |
90 | External shower (2 sides) | Useful for washing of clothes, cleaning teeth, and in warmer months for a shower | √ | √ | √ | √ |
91 | Internal shower and basin | Shares shower attachment | √ | √ | √ | √ |
92 | Diesel heater (water and air) - 4 kw (larger optional for model 4) | Heating cabin and HOT WATER | √ | √ | √ | √ |
93 | Truma Gas radiator | For that instant noiseless 'atmospheric heating' | Optional | Optional | Optional | Optional |
94 | Standard water filter | √ | √ | √ | √ | |
95 | Sureflow water pump (standby included in 'spares') | √ | √ | √ | √ | |
96 | Gas fired grill/oven | √ | √ | √ | √ | |
97 | Microwave | Optional | Optional | Optional | Optional | |
98 | External gas socket | Optional | √ | √ | Optional | |
99 | 12v extractor in bathroom and kitchen area | √ | √ | √ | √ | |
100 | Main fusebox/controller with level gauges, voltmeter etc. | √ | √ | √ | √ | |
101 | Water filtration system (membrane technology) | Safe handling of poor water quality | Optional | Optional | Optional | Optional |
102 | 4-way speakers in living cabin | Optional | √ | √ | √ | |
103 | Light strips around roof windows | Efficient low level background lighting | √ | √ | √ | √ |
104 | Custom beds (rear usually form table base), inter-changing with living room sofas | √ | √ | √ | √ | |
105 | 220 litres clean water tanks (Backup up water pump carried but not fitted) | Useful minimum | √ | √ | √ | √ |
106 | Additional fresh water tanks | √ | X | X | √ | |
107 | Grey water tank (60 litre) | Useful in some inner-town locations and/or protected/nature parks, where direct leaking to road/ground not desirable or acceptable | √ | √ | √ | √ |
108 | 12v Macerator porcelain toilet (60 litre tank) | Provides more capacity than cassette toilets, avoids need to have external access panel fitted | √ | √ | √ | √ |
109 | Solar charging with regulator | Required given diesel heater and large fridge | 200W | 200W | 300W | 400W |
110 | 270 degree awning plus LED lighting | 10sq m from only 2.6 m length external storage and offers 2 different positional aspects (help deal with movement of sun throughout the day) | √ | √ | √ | √ |
111 | Generous fitting of 12v, 230v and USB sockets in front and rear cabins | √ | √ | √ | √ | |
112 | AGM 100 A hr batteries | 1 | 2 | 2 | 2 to 4 | |
113 | Vented/separated chamber for 1 11 kg propane gas bottle with piping, access etc. | √ | √ | √ | √ | |
114 | TV-DVD player | Optional | Optional | Optional | Optional | |
115 | Cabin Sound system | Optional | Optional | Optional | Optional | |
116 | Satellite receiver & dish | Optional | Optional | Optional | Optional | |
117 | Burglar alarm | Optional | Optional | Optional | Optional | |
118 | Large opening 'panoramic' window panel | √ | √ | √ | √ | |
120 | Real glass windows (only with 60 mm walls) | Optional | Optional | Optional | Optional | |
121 | External entrance lights (LED's) | √ | √ | √ | √ | |
122 | Custom between seats storage unit | Optional | Optional | Optional | Optional |