im a brand new camper so take what I say with grain of salt :) I have a 01 suburban half ton and a 06 30 ft skyline seaview with a dry weight of 4400 lbs. I might have a total of towing 150 miles. I wouldn't go any heavier if possible. I have to admit though some of my problems will be fixed with a weight distributing hitch with sway bar. It is on the short list to buy.
The suburban down shifts to second a lot on the hilly terrain in my area. It is not horrible but it might get old a few trips down the road. I will say that I recently paid off suburban so im in no hurry to upgrade tow vehicle. I guess my opinion is buy something lighter or upgrade tow vehicle.