With the 350 HP engine it is the LTC which is the higher end TradeWinds. I have had my 2001 TradeWinds since 2004 and have never regretted buying it. National built a quality unit. Just take a look at the RV sales lots and see if you can find a National product (gas or diesel), seldom will you find one. I'd just do the usual things like tires, service history, batteries, look over the ceiling really good for stains which could mean a water leak. Take it for a ride and if possible run it up a long hill and watch the temp gage.
Joe & Angie
Shih Tzu's Cookie & Rocky
2001 Tradewinds 7390 2011 CRV EX-L Navi w/ RoadMaster FuseMaster