We have a 1982 21' Sunrader and we carry a 1968 Honda Trail 90 on the back bumper, a 50 pound generator under the bed and we go over 9,000+ foot passes. We try to pick back roads whenever possible and travel when we think there might be less traffic (early morning). We do what we can but it is not unusual to get down into first gear for awhile. We pull over a lot to let others by. It is slow going but put on your hazard lights when going uphill and people will deal with it. There is the occasional jerk though. Paul & Jacki on the Dragonfly