Hi wb2nco,
Welcome to the Heartland Owners Forum. There's a lot of useful information here along with a great bunch of friendly and helpful people.
I don't have a North Trail, but if you're looking at a new 2011, you ought to be able to get a great deal. Look on the frame for the manufacturing label that shows date of manufacture. If it's been on the lot for a few years, you should inspect very closely for signs of water intrusion. Caulking is supposed to be checked multiple times per year and this trailer may never have been checked or re-caulked. Even if everything looks ok, you might want to ask the dealer to recaulk the entire trailer.