How fast can you safely go in a motorhome? There is a severe grade between Bishop, CA and Twin Lakes. In the 1970's-80 my father was telling someone that he could pull that grade in his 30' Vogue MH at 80 mph and was told that was BS.
So the $500 bet was on.
Before the run up the grade the other party talked with a friend of his and was told, "Hey, I was passed by that motorhome on that grade and I was going 80 mph." BET OFF!
Dad built an engine for a friend's 34' motorhome. The owner framed the CHP ticket that he got for running 95 mph racing a Jaguar on a California interstate.
Both engines were stock stroked 440's with aluminum dual plane intakes, headers, ported factory iron heads and a good camshaft.