to the group. Can't help much with your question, but do as stated above, we have a forum for most of the Forrest River brands of campers. There you will find the things specific to your brand of camper.
Also do a search on here for PDI. (Pre Delivery Checklist). You will find seveal, so print one out, and take with you to look at the camper. Get the owner to have power and water on it, and check everything on the list. I would also ask the owner if they kept a camping journal or records, and maybe look at it, to see how many miles towed. Thinking of tire and brake wear here.
Last thing, but should be first, what are you towing with, and can your tow vehicle safely handle it?
2012 Ford F250 ext. Cab 4x4
2002 Jeep Wrangler Sahara
2008 Yamaha V-Star 650 Classic
2008 Work and Play 18LT