Well, in fact you can make some animated chains and import the animation also , and use some simple box collision, depending on the terrain if it is flat or not !
The thing is, that I don't want to use "c_move" for that. I want it to be physical. I've already made the one with "c_move", works very well, but not as I want it to.
with my method you can use the wheels-physic. the positions of the pathpoints set in the script in a while-loop and move the passable chain-parts from pathpoint to pathpoint. its a little bit tricky but will look very realistic.