We own a 2009 Bounder 32W, bought used in 2010. I've had trailers, fifth-wheels, gas and diesel trucks, etc. We really like our Bounder and have had good service from it. Regarding climbing mountains, we just got back from a week at Lake Tahoe. We live in California's central valley and the climb to the lake takes you over a pass that is about 7,400'. The Bounder handled it just fine. I note that you have a diesel truck. You do need to realize that the gas V-10 in the Bounder makes its power with higher RPMs. It is perfectly happy to rev above 5,000 RPM, though I generally find it settles around 4,700 and about 40 mph on most 6-7% grades. Yes, it gets loud and some people are bothered by that, but the engine will run all day at high RPM and do fine. I never see any rise in engine or transmission temp, with the cycling of the engine cooling fan the only indication that it is working harder. We like our Bounder,