You may think that, but remember they still have the suspension, springs and shocks under there make it a shifty moving surfacetoo cool! that must be a thrill to get behind the wheel of. i couldnt imagine powering something like that.
i gotta ask, why do the cars keep sliding around? i would expect that once the truck is on top it would basically just indent into the ground. all that weight getting thrown around has to go somewhere...