it has maybe 24 small rubbery wheels. The front has a semi truck cab. And in front of that, at window height; a wheely bar. The same width of the truck. It would hit the wall first before the truck and pivot the truck to angle the wheels to climb a wall.
After the cab, there is a v8 engine block. A large yellow roll bar... which is like a handle to hold the truck. I cant remember what was after that. And the very end, two dump truck type containers but like the ones used to mine coal.