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OKA NT and Camper Back-Section Specs

Main specs, equipment and requirements of our off-road camper, built on a 6.5 t Australian OKA-NT cab-chassis with a mounted back-section from Alu-Star in Germany


Travelling the world's remote areas alone requires much better preparation than travelling in convoys. One has to be able to handle all sorts of technical, medical and environmental emergencies by oneself.
Even if the list below looks like being totally paranoid, it is in fact just part of serious planning and the hope to never use the whole lot.


The resulting truck is based on the following requirement:

  • 2 passengers
  • Several years of non-stop travelling
  • Suited for all climates
  • Used to travel alone in remote areas
  • Range approx. 1400 km (with 80 l Diesel in Jerry Cans)
  • Self sufficient for 7 days, + 4 days contingency under all circumstances
  • Very good and complete set of gear to get out of all sorts of troubles


The truck


Standard setup



OKA: OKA, Bibra Lake, WA, Australien (the company doesn't exist anymore)
OKA-NT cab-chassis


"Cummins" ISBE 170 30 (Emission standard Euro 3)
4 cylinder; 4 litre; common rail turbo diesel;
170 HP 125 kW @ 2500 rpm; 600 Nm @ 1500 rpm


"New Venture" NV4500HD
5 speed manual

Transfer case

"BAE / Vickers". Semi-permanent 4 wheel drive; 2 speed; no diff between front and rear axle e.g. centre locked if in 4WD


"BAE / Vickers". Front: live axle 3485 kg; Leaf springs (12 leafs); 4 shock absorbers (2 optional)
"BAE / Vickers". Rear: live axle 4385 kg; Leaf springs (13 leafs); 4 shock absorbers (2 optional)


Ventilated disks front and rear

Fuel tanks

2 tanks 115 litre each (1 tank optional); 80 l in 4 Jerry Cans

Options (OKA supplied)


PTO and oil pump for hydraulic winch

"Muncie" TG Series PTO; "Muncie" TG Series Lectra Shift System; "Eaton" hydraulic pump
running from NV4500HD gear box (this is NOT a standard OKA option)

Diff locks

"BAE / Vickers". Air operated 100% diff-locks front and rear (2011: removed)

Locking hubs

"AVM" Free Wheeling Hubs

Hub step front

OKA built


"Titan" 19.5" x 8.25" Bolt Together Rims
(OKA delivers ordinary steel rims of the same dimensions as standard)

Bull bar

The new "bolt on" type in steel

External sun visor

OKA built

Air condition back

Normally used for bus bodies

Rust proofing

Spec 3

Cruise control

ECM controlled

Exhaust brake


Dual battery system

Smart relay from "Redarc" (old type). Battery separator switch to connect both batteries for an emergency start and to load the starter battery using the facilities of the back-section

Extras (not supplied by OKA)



"Paralizer" P 165
(mandatory to get an comprehensive insurance for the truck in Western Australia)


"Michelin" XDE2+ 305/70 R19.5 (uni directional) or
"Hancook" DH05 305/70 R19.5 (bi directional)
tubeless (two spares, one mounted on rim)
(OKA standard dimension since 2007)

Air suspension

"Firestone" 1T14C-1 air springs (required to upgrade the OKA to 7260 kg GVM) (2012: removed)

Electronic rust-proofing

"CouplerTec" HD4WD 4 coupler system



Touring range

800 - 1000 km (1000 - 1400 km with 80 l diesel in Jerry Cans)

Measurements (including back-section)

Length: 5.98 m (6.52 m)
Width: 2.0 m (2.10 m)
Height: 2.51 m (3.2 m)


Cab-chassis with options and extras but without back-section: ~ 3600 kg
GVM: 6500 kg (7260 kg after suspension upgrade)
GCM: 9000 kg


Max. 120 kmh (typical 70 km/h on gravel roads, 90 km/h on sealed roads due to fuel consumption)

Turning cycle

14.5 m

Fuel consumption



Consumption per 100 km (approx)

90 kmh

bitumen, flat

22 lt

30 - 70 kmh


25 lt

30 - 70 kmh

off-road, rocks, gravel

18 lt

20 - 50 kmh

off-road, deep sand

30+ lt

30 - 110 kmh

year average

22 lt




CB UHF Radio mounted:" iCOM" IC400Pro; 477 MHz 5W (Australian Standard); Antenna: short 15 cm antenna on roof
CB UHF Radio handheld: "GME" TX6200; 477 MHz 5W (Australian Standard)
Sat-phone: Iridium "Motorola" 9505A; External Antenna; 500 Min Prepaid card from "France Telecom"; Mail access via
2 mobile phones (to call each other when separated in foreign towns)
Internet connection: Nokia mobile phone used as modem to LapTop via Bluetooth


GPS Main: "Garmin 276C" (capable for street routing); External antenna.
GPS Hot-Backup / hiking: "Garmin" GPSMAP 62st; External antenna.
GPS backup for hiking: "Garmin" eTrex
GPS in emergency package: "Garmin" eTrex
PC: "Trophy-Tec" NavComp III; Connected to GPS 276C, GPS 62st and the Sat-phone.
Software: "Touratech" TTQV Version 4 moving map software; "Garmin" Map Source; Garmin" BaseCamp; Garmin-PC
Paper maps: various maps and guides
Vector maps for GPS and TTQV4: "Garmin" Australian Metro Guide; European Metro Guide; "Tracks4Australia"; "Tracks 4 Africa"; Garmin NT South-America; Mapear V9.90; Viajeros Mapas; Brasil-TRC; OSM South-America
Raster maps for TTQV4: "Natmap" Raster 2008 Australia map; "Schweizerische Landestopographie" Swiss Topo 50;
"bsmap" for African and South-American countries; 50K maps for certain areas in Australia

Emergency and security

Extensive emergency and survival kit, packed into 2 red "Georg Utz" Rako-boxes ready to be taken out in seconds, in case the truck catches fire.
Fire extinguisher 6 kg foam-type
2 breathing masks for 10 minutes: "Braegger" Parat C
Extensive medical emergency set and literature.
Extensive anti-theft and hold-up measures.


Full set of tools for all the repairs we are able to do by ourselves.
Most commonly used and most critical spare parts.
Service- and repair manuals, electrical diagrams and parts-lists for the whole truck and the equipment of the back-section (all as PDF-files).


Hydraulic winch: "Warn" Series 15000 HYD. The gearing is: Main gearbox -> Muncie PTO -> Eaton hydraulic motor -> Warn hydraulic winch
Winch rope: "Dynamica Rope" 11mm; 35m long; Winch extension strap: "Dynamica Rope" 11 mm; 30 m long
1 recovery strap 4 m; 14 t; 1 recovery strap 10 m; 14 t
1 snatch strap 14'000 kg; 1 snatch strap 8000 kg)
1 "Mud Mauler" chain winch. ca. 4.3 t haul
NATO Tow hitch (for recovery only)
1 hydraulic 11 t 3-stage bottle-jack.
Sand boards: 6 fibreglass-reinforced sand boards 150 cm x 40 cm from "".
Earth nails: Model used by the Swiss fire brigade
4 snow chains (mainly for mud driving)
Snatch block: 1 "ARB" Snatch Block 9000. SWL. 9 t, Breaking strength 17.5 t
Shackles: 4 x 8.1 t SWL; 1 x 5 t SWL; 1 x 3 t SWL
1 Drag Chain
1 long handled shovel; 1 spade.
1 pick-axe.
1 chain saw "Rancho" 230V~; 1300W.
1 bow saw; 1 jigsaw.
1 big axe; 1 small axe; 1 machete.





Aluminium-Foam-Aluminium sandwich plate for good environmental protection (thunderstorm) and ruggedness.
Walls and top 80 mm: 3 mm Aluminium; 76 mm isolating foam; 1 mm Aluminium
Floor 110 mm: 3 mm Aluminium; 80mm foam; 1 mm Aluminium;
20 mm foam for floor heating; 3 mm Aluminium; 3 mm Linoleum.


Main-door: Split door; Upper part hinged at top and acts, when open, as rain protection; Lower part hinged at the side; During the night the mozzy screen door inside the main door can be closed together with lower part of main door.
Driver cab access: Due to security reasons, the escape-door can only be opened from the back-section.


3 big "Alux" wind-out windows: Aluminium; Double glazed; Security glass; Covered by Aluminium lids for better isolation, security (RoRo-ferries) and environmental protection.


2 large Polycarbonate hatches; can be steel armoured from inside for RoRo-ferries.

Chassis - back-section adapter

100 mm galvanized steel frame mounted on rubber dampers.

Cab - back-section connection

Driver cab and back-section are hard mounted. The back-section is fully isolated against the cab.
The cab is accessible from the back-section through an escape-door. No access possible from the cab to the back-section (theft protection)


Cabin overall: Length 3910 mm; Width 2100 mm; Height 2040 mm (w/o chassis adapter).

Heating and Cooling

Heating: Underfloor heating driven by OKA's motor cooling system or by the "Eberspaecher" Hydronic D 5 W SC diesel water-heating. Thermostat controlled.
Cooling: Air-condition driven by OKA's motor. Used only to dry out the camper while driving.


Batteries: 2 sealed 6V AGM batteries (in series); 380 Ah. Charged either by alternator via a smart relay, solar controller or 240V~ from the battery charger.
Solar panels: 8 x "Shell" SM55; Max. 440 Wh.
Solar controller: "Plasmatronics" PL40; Max. solar power 40 A.
Battery charger / inverter / transfer system: "Studer" Compact C1312:
Battery charger: 55 A; Inverter: 1300 W; Transfer system: 16 A.
12V= circuit breaker/switch panel: "Philippi".
Battery monitor: "Waeco" Mobitronic Controller (measurement via shunt).

Water tanks / pumps

2 x 100 litre in stainless steel tanks. No connections on the side or bottom of the tanks.
Tanks withstand a car-fire without leaking.
20 litre boiler "Waeco" Mobitherm CAL020 heated by the OKA's cooling system, by the"Eberspaecher" Hydronic D 5 W SC diesel water heating or by 240V~ from the inverter.
Water pump: Inlet: "Gardena" pump 5000/3 SGP; 240V~; 750 W; 5200 l/h;3.3 bar.
Water pump: Filtered water outlet: "Shurflo" Smart Sensor 5.7; max. 24 l/min; 4 bar.
Water pump: Bore water outlet: "Shureflo" (only used if water system is switched to two-water-quality-mode)
Water level gauges: "VDO" Freshwater tank gauge.

Water treatment

Water inlet: 10 µm particle filters; 3 in parallel (for better throughput).
Water tanks: "Katadyn" Micropur forte (for conservation).
Water outlet: 5 µm active carbon filter; Followed by a UVC-sterilizer: "SterilAir" AQD64-C: max. 20 l/min (1200 l/h).


Stove: "Wallas" 95DU; Diesel; Glass-ceramic; standard pans for electric stoves
1 induction cooking plate 240V~/1200W driven by the inverter or up to 2000W with external power connected.
Sink and faucet: "Ideal Standard" faucet, "Blanco" Steel double sink; Standard household equipment.
Fridge: "Wemo" 78 litre stainless steel; No deep-freezer; External "Danfoss" 35 compressor; "Wemo" Ecotronic.
Kitchen-, side- and main-table: 3mm Corian coated wood, completely sealed. The only wood used in the whole back-section.


Shower: Inside shower with shower curtain; Outside shower.
Toilet: "Thetford" Porta Potti 345.


All furniture is built on Aluminium frames. Walls and doors are painted Alu-Cobond (Alu-Plastic-Alu sandwich).
There is no wood used at all except the table and the kitchen table top.


"Göckler" 2 kg CO Fire extinguisher; "Mentrex" Flame Stop 125 x 180 cm fire protection towel.
Removable fire/smoke alarm outside.
Fire/smoke alarm inside.
Ultrasonic intrusion sensor in front cab, Narcotic gas alarm and CO detector inside back-section.


Tools / equipment



2 full size foldable "Dahon" Zero-G Performance mountain bikes enhanced as touring bikes; equipment for tours lasting several days.

Hiking gear

Tent for 2 persons: "North Face" Nebula; "Deuter" Sleeping bags; Self-Inflatable "Therma-Rest" mattresses.
Backpacks for day-tours and for tours lasting several days.
All the necessary bits and pieces for several days lasting tours (orientation, cooking, toilet, security, first aid).



No liability for timeliness, integrity and correctness of this document is accepted.
Last updated: Thursday, 10.01.2019 4:12 PM

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