Don't let the naysayers & old ladies bring you down... ;)
We've bought three big diesel pusher motorhomes on eBay: "sight unseen". Kept each one for a couple years, used them a lot. Sold one for about what we paid for it, one for $5500 more than we paid, and one for $1200 less than we paid.
It's not all that tough to do. Learn the market for what you want to buy. Asking prices are irrelevant, it's selling prices that matter. Very easy to do on eBay. (By the way, if you do have a problem, don't expect eBay to do anything to help you.)
Establish a real value on what you want, then drop that number by several thousand. Example: we've bought motorhomes that are advertised by dealers for $75-80K, real value around $65K, we paid $55K. That allows for the inevitable cosmetic spruce up, etc. Plus a cushion in case there are more serious issues, but you would in reality have to fix those on any used coach.
Secret Tip: In general, RV extended / aftermarket warranties are fundamentally worthless.
In our case, buying motorizedhomes, we flew in and drove home. In your case, you will in all likelihood drive to pick it up. That does make a case for closer rather than further.
My proven technique to scoring exceptional values on eBay RV's:
1. Research and know your market. Thoroughly... Check SOLD listings for reality...
2. Research and vet the seller. Pretty easy to do these days... Be especially interested in past eBay feedback, or worse, if the seller has no feedback which might be because they closed their account with horrible feedback and are reestablishing themselves all fresh & clean.
3. Be willing to make small repairs, clean up, etc. If you want a new coach, buy one...
We're currently looking for a 37-40' fifth-wheel to stay in whilst we build a new home. As usual, the better deals appear to be in Flahrida or some such other far flung locale. I'll probably look more in the AZ area, as there are indeed a lot of used trailers there. I think ye old ancient midwest northerners flock there, and then the old man croaks and granny wants to sell. Great buying opportunities! :C
I would encourage you to search the southwest, as that's an easy drive to pick one up. I also have a good friend in PHX who actually owns a 5th wheel trailer, and at my request would go look at it in person, with no bias... P/M me if interested...
Happy Hunting!:B