Any travel trailer that is "approaching 10 years old" has the potential to be an excellent purchase or a disaster in disguise. At that age, it all depends on what maintenance the previous owners performed and what they ignored. You may find an excellent investment, but you're just as likely to find a trailer with water damage, bent axles, leaking tanks/valves, poor/damaged frame or sidewalls and who knows about the appliances.....
So, about the best anyone can offer without seeing the trailer you're thinking about purchasing is to go over it carefully and make sure everything is working and not damaged. If you're unable to inspect it or don't know how to inspect it, possibly you could hire a "mobile RV tech" to inspect it for you. Some offer that service, some don't, so you'll need to look at who is available in your area.
There is a "Pre Delivery Inspection" (PDI) checklist on the forum. If you choose to do your own inspection, that checklist is a valuable tool. You can access it here:
http://www.keystoneforums.com/forums...ead.php?t=5129