Whatever you buy, you should expect to spend some time doing preventive maintenance right up front. I would check and re-caulk (or Eternabond tape) the roof edges, seams and openings ASAP, then work your way down the front/back/sides with a non-silicon caulk as needed. Inspect your plumbing while it's pressurized and ready to use, etc, etc. If you're not handy have the brakes adjusted/checked and bearings lubed/checked. Learn about the term PDI, and do it thoroughly. If you're thorough, after that most brands will be pretty equal.
