riverhawk, welcome! I would not worry at all on the lack of use, I believe it to be a benefit, you are now in a position to pick up a trailer that is practically new and you won't endure the depreciation from a "New" purchase. When first time buyers get their new RV, it seems they either love it and use it as much as possible, or don't and end up selling it after a couple outings. With your situation it seems like personal problems conspired against the owner and he is no longer in a position to use it. Either way, you are now in a position to help him out of a bad situation and upgrade to a great trailer!!
The one issue I would be looking at is the tires. We purchased a 2008 trailer and the tires on it were made in 2005. If the RV is 2 years old, there is a good chance the tires are 4 to 5 years old and should be replaced. Here is an excerpt from "NewRVer.com" that talks about tire age...
"The useful life of a tire is only five to seven years. For cars and trucks driven every day, the tread usually wears out in less than five years. For RVs that sit for a good part of the year, five years can pass with a lot of tread still left on the tire.
Although you may not want to replace what looks like a perfectly good tire, riding on tires more than five years old greatly increases the risk of a blowout.
Date Codes: Every tire has a date code stamped on the sidewall, which gives the date that the tire was manufactured. They look something like this: DOT PDHH MLOR 3403. The date code can be on either side of the tire, so you may have to crawl underneath the rig and look on the inward facing side. The date code always starts with the letters DOT and ends with a 3 or 4 digit number. That last number is the date code, which tells you when the tire was manufactured. The first two numbers indicate the week (out of 52) and the last one or two digits indicate the year. For instance, 3403 means the 34th week of 2003, or the last week in August 2003. Starting with the year 2000, the date codes have two digits for the year, prior to that, only one. A date code of 079 would indicate the seventh week of 1999, or the third week of February 1999.
Tires deteriorate with age, even when sitting on a shelf, so always ask to see the date code when you purchase new tires and insist on tires manufactured within the last few months. The tire dealer may give you a funny look because most consumers don't know about date codes. "
Look at the date codes on the tires and if they are 4 or 5 years old, ask the seller to reduce the asking price by $500 to cover the cost of new tires.
I hope this helps and good luck with the purchase!!
2006 Nissan Xterra
B&M Trans Cooler
2011 Nomad 206
Panasonic/Pioneer/Kicker ~ Audio/Video System
Days Camped /2009 / 33