You could now buy a retired Russian military truck (KrAZ-255B) for as little as £ 4,145

My dad got to drive one of those during his time in the East German Army (~1987), he said that this thing simply doesn’t get stuck anywhere. The engine would run on the lowest quality Diesel you could find, still it would make about 650 lb ft torque. The tyres are self-sealing and -inflating; the bed can carry loads of up to 16,000 lbs. Ladder frame and cabin are made from the same steel that was also used in the T-55 tank. Of course all this power comes at quite a price: The best possible mpg that can be achieved is 6. Yes, 6. In very heavy offroad conditions, the truck might as well go under 1 mpg.