Going, going, gone...
If you are selling on Ebay you will find that the more complete a description that you can give the better. Selling stuff in "unknown condition" leads most people to assume it's broken. A pair of examples are up for sale right now. In 2 separate auctions for 1973 Argosys. One 24' and one 26'. The one description is long and detailed...A recently used camper the mechanical condition is well known and near perfect. Yet the other camper has sat for a long time, needs a few obvious items and the condition of the mechanical systems is unknown to the current owner. Not surprisingly with 2 days left in each auction the high bids are very different: $5,100 and $1,600. Also, you can check the "already sold" history on Ebay for more comparisons.
Have you never questioned those who travel? Have you paid no regard to their accounts- Job 21:29