Thanks for the leads. A couple of years ago, when we were at Disney, I had to peel back some of the siding, to get at a leaking pipe in the bathroom sink, and found the alum. frame.
Hornet sistered in wood studs, to attach the interior and exterior siding. The camper is about 1900 lbs. dry, which is a lot less than what I can find out around New England. Very few truck camper dealers up here in VT, and the prices of new larger units are so much, that I thought it would be much cheaper to rehabilitate an older, well built camper. We tow a light boat, and the Hornet is on a F250. The Sunlites are good on weight, but are wood framed, and not as well finished, and the Lances are beautiful but way too heavy and pricey. The idea of a structurally strong frame, which is affordable and not in need of a one ton truck frame , has escaped the present generation of manufacturers. The only thing that I don't like about our Hornet is the "wings" on the back of each side. The last owners attached hyd. jacks to the totally wood frame, and they loosened up over the years.