We have a 2011 Newmar Canyon Star on a Workhorse W22 chassis, 8.1L gas engine. We've traveled throughout the west towing a 2007 Saturn Vue. Never had a problem going up (or down) steep grades in the Rockies, although we wouldn't win any speed contests. I believe a Ford V-10 would give similar performance. For us, the gasser has been ideal--much lower initial cost, cheaper (and easier, if you do your own) maintenance. If I were full-timing, I might consider a diesel, given it's higher Cargo Carrying Capacity. Go for the gasser!