Was reading a report on the ex army 6 wheelers being sold. Have to be the ultimate tray back if you could put up with the max speed and noise. The GVM was insane and included 6 full jerries as well iirc.
a couple of problems, you cannot drive them on a car licence and i believe rego is somewhere between $1500 and $2000....once you get over that hump max.
speed is around 105km/hr +/- 5km/hr, with a bit of tweeking you can get this to 120km/hr which makes the whole rig more drivable
noise, seriously this rigs are noisey, once i got over 80km/hr i wore ear muffs
flat to the boards at GMV mine used around 20L-22L/100km which isn't too bad..cruise at 90km/hr much better on fuel