2CV Sahara. Not only does it have a 425cc engine in the front driving the front wheels, it has another just like it in the back driving the back ones. Four wheel drive by unusual means then at the cost of just a little complication. Then again, if one engine or one gearbox should let you down you could still proceed, just not very quickly.

Yes, I did ask how they get the cars up there. They have an industrial hoist hidden under the floor.