The bottom line is that anything that has an axle under it will require SOME maintenance or possible repair. Nearly all RV roofs have a through hole or three for circulation vents, plumbing stacks, air conditioners, etc. The sealant on these needs to be observed and sometimes, refreshed. The running gear has a maintenance schedule too, bearings,brakes, tires, etc. Heating and cooling efficiency is primarily influenced by the amount of insulation installed, which type, and the condition of the appliances. The trailmanor has more moving hardware than a fiberglass trailer (lift mechanisms). They both have windows and doors, things that may also need attention.