I think he's suggesting that the rubber things you found aren't part of the truck, but actually parts to the "small portable ramps" you had the truck on, used to "chock" the wheels to prevent the vehicle from rolling off the ramps.

For clarity, refer to the following crude illustration:

[img]http://www.geekoasis.com/turtle/ramppic.gif[/img]

an idea is only stupid if you think about it rationally.