Might be hard to find good financing for such an old trailer. I was looking at Good Sam but ended up with better dealer financing where I bought my preowned AS.
Have the seller send you photos.
Ask if the trailer has been serviced regularly. Ask how old the tires and if the brakes are in good shape.
Any history of water leaks to the interior.
Any floor damage due to water infiltration?
Any hail damage or other external damage? Any panels replaced if damaged?
Are all systems in working order? Electrical system, plumbing, AC, fridge, water heater, propane system etc.
How old are the house batteries?
Inspectors can be found on the main Airforums page. Look under Kansas. There is one member in Olathe who shows lots of posts.
2008 Classic 25fb "Silver Mistress"
2015 Ram 2500 6.7L Cummins. Crew Cab, 4x4, Silver
2010 Tundra 5.7L, Double Cab, 2wd, White