It is possible for things to happen between check in and check out on a trailer...In fact we often read headlines like:
27 RV's broken into on Dealer's Lot.
Also some things (Termite, Water damage, Leaks) may not be obvious at check in but six months later at check out.
IN fact I have (intentionally and for other reasons) left out many,many things that can go wrong while the RV is "Just Sitting" on the dealer's lot.
I might add....IF I were a dealer, when a trade in came my way, I'd be doing a "Pre-Trade-in-Delvery" inspection as well....A somewhat involved apprasial...Looking for the very same things.
When I towed my trailer up to the dealer,,,,Took me a while to find the Title (like 2 weeks later) We agreed on the trade in value though (HE ended up giving it to an employee as his "Dog House" (As in where you live when your wife gives you the boot,,,,Not where you house the canines)
Home is where I park it!