Many years ago we had trouble with a slideout in a new t5th wheel trailer. The dealer told us to take it to the factory for repair/adjustment; saying their technicians did not work on slide mechanisms enough to know what to do when.
We did go to the factory, and when I asked the service manager there about what I was told concerning the dealer techs not knowing, he said that was right.
Bottom line I would just tell prospective buyers the slide drags on the floor if/when they ask, and price your TT accordingly.
BTW there is specific product sold for this problem, and is what I finally would up buying: https://www.amazon.com/AP-Products-0...4143821&sr=8-7
until I could get to the factory.
I actually wound up using them all the time after the factory replaced the mechanical workings for the slide room.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy