I am here in Switzerland on a 10 day vacation for my wife's 60th Bday. All I can tell you is there are a ton of class c motor homes with either the spinter, dodge or ford (yea, small ford diesel chasis)
These guys are cruising around up to 8000 ft and they seem to be doing fine.
I agree, i would want to see how they do first. And I used to own a V10 in a CC 4x4 pickup. had a lance self contained camper on it and towed a wrangler. I could go up the grapevine here in calif doing 70-75 with power to spare. It was funny passing people in their mini vans struggling up the grade with this fully loaded rig. BUT, I would get 3-4 MPG in this situation. Going across Nevada and Utah at 65PMH without the wrangler I would average 8.5.
now that i am looking at retirement, if I could get an RV that would average 15-16mpg I would really have to consider it. When your looking at a fixed income, you start to count your pennies vs hitting the grade at 80 mph
