The V10 performs great, but it is a small -block so it does have to rev to make power. It won't hurt it though. I've spent 10+ minutes sustained around 5,000 RPM.
372,000 miles on it so far, about half that is towing miles with a typical combined weight of 22,000 pounds. No repairs aside from routine maintenance except for a radiator, heater hose, and a few starter relays. I do think I will soon need a new stater and fuel pump however. It seems like the fuel pumps almost have an inverse-life cycle.... The more you drive, the longer they last. MHs that sit a lot seem to have the most fuel-pump problems (ditto with sticking brake calipers).