How 'bout we use the rabbit droppings to fuel a burner in back. Heat from the burner can be routed upward through the roof, but intercepted by a wheel that produces enough current to load a coil that is connected to a spark plug mounted on the methane gas nozzle. Every time a female rabbit drops a new bunny, the young one falls on a switch that collapses the coil field and the spark plug ignites an explosion from the rear of the truck.

We could call this powerful system the Flame Associated Kinetic Energy Fast Ascent Rough Terrain engine....... or....... F.A.K.E.F.A.R.T.

I think it'll become known as a kind of wasted spark ignition. <img src="/forums/images/graemlins/wink.gif" alt="" />

Frank <img src="/forums/images/graemlins/cheers.gif" alt="" />