Most Dealers don't do any checks on RVs they trade in on new ones. They simply give them a clean (although the seller has usually already done that in the hope of getting a better trade in price) and put them on the yard (that's what my dealer salesman told me). Most don't have faults as they were already sorted when under warranty and the warranty on a 2nd hand RV is pathetic.
If I was buying from either a dealer or privately, I would get it first inspected by an independent van repairer (and a mechanic if a motor home). Many repairers specialize in this service - there is a major company in Perth who do this and you can either take the RV to them or they will go to where the RV is. Cost varies - but this particular one charges about $200 - and they provide a full check sheet (I know the owner of this firm is honest and he does do a good inspection)
Two very broad statements there Bruce or Bev. I haven't dealt with, or know most dealers, so I couldn't really say
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Yes I am an agent of Satan, but my duties are largely ceremonial.