I have the model 7390 with the angled door. The LTC is 4" longer, the interior is a little more ritzy and although they both run the same CAT 3126b engine the LTC is 330hp, while mine is 300hp. Not a big thing really on the HP, I could have mine programed up to 330, but am totally happy with the power and mileage the 300 gives me. Bought it used in November 2004 and have never had any major type problems. National built great coaches. That's why you hardly ever see either the diesels or gassers sitting on a lot You might want to check and see what chassis the LTC is on, mine is on a freightliner chassis. Mine is rated for pulling a 5000lb toad, not sure if the LTC is rated higher or not.
On the door of mine I get a lot of wind noise depending on the direction of the wind. I have found nothing I would giver her up for unless I won the lottery.
Joe & Angie
Shih Tzu's Cookie & Rocky
2001 Tradewinds 7390 2011 CRV EX-L Navi w/ RoadMaster FuseMaster