I have a 2006 carriage and on the slide motors on the 2 big slides. The 3 bolts that hold the slide motor on were starting to work loose. They never got loose enough to screw up the gears. I was checking them every so often to prevent that. When they started to work loose I cleaned up the treads on the bolts and put blue locktite on them. I check them every so often but have not had a more problems.
You are not going to buy any brand trailer that you won't have to do something to sooner or later. It is just like owning a house.Their is stuff you have to do to a house to keep it in shape so you don't have big problems. Carriage is one of the top quality 5th wheels . Not only outside and inside. But between the walls where it counts also.