Dont forget the roof! Go up every six months to clean the roof and check the seals up there. As you see cracks develop, go up and Dicor them.
The buyer of our last Jayco said that amongst other things, the top three that sold him on our six yr old tt was:
-roof maintenance! Having the attached ladder was a clue we maintained the roof (only because his experience was that those who didn't have a ladder, probably didn't check/clean the roof). After going up, he saw that someone had one or two 'Dicor-treated' layers where typical cracks more than likely showed on the seams over the years. He could tell we washed the roof as part of the maintenance as well. This guy said he had seen several rv's where the roof was filthy and very old cracks showing in the seams that were never Dicor'ed.
-the binder with all the original paperwork, and, warranty/maintenance (receipts etc) completed.
-the wheel bearings!!! We had records of when we 'repacked' the bearings.
Hope this helps