Buying on eBay
First, most of the real action on eBay usually takes place in the last few minutes. I have seen prices jump so fast that it takes the eBay site a few minutes to sort out the bidders than come in with 15 or fewer seconds remaining. But that said, when I am interested I will make a very early token bid then wait to snipe at about 30 seconds remaining.
If you win, about all you can hope for are some price concessions based on undisclosed condition issues. Here are some I would be concerned about and might have asked the seller about early in the process.
: AGE, ferget condition, if they are 10 years old, you can't even safely tow it home.... Anything over 5 is bad news. Know how to read tire date codes.
Condition: Just from the pics, that one looks a little on the low side, check the tire/wheel well clearance. Again it looks low, typical for older Scamps.
: Ask the seller to have it connected and running on electric at for at least 4 hours before you get there. You can test if the gas works yourself.
: Take a meter and be sure that the AC/and DC systems actually work. But count on a new battery
in any case.
A/C: Take a close look at the installation for leaks
and be sure it works.
Be sure the water pump works. Take about three 1 gallon jugs of water to put in the tank.
Any time that the seller tells you "We didn't use that, but it works", assume it doesn't unless proven otherwise. I have even gone as far as taking an LP tank with me for an inspection when the seller claimed he couldn't get the tank filled.
Best bet, inspect before bidding, but I know that's not always possible.
BTW: I see that the seller only posted one buyer question. I am sure more were asked, but he didn't post them for whatever reason.
Good Luck, Let us know how it turns out.