Hi everyone,
I'm the original poster, there was an issue with my account but it's straightened out now.
I contacted Northwood, they said in 2003 the construction was fiberglass over plywood, wood studs with insulation in between then interior plywood. We have ruled out that Nash.
After doing a lot of reading on this site I decided to stay with the Nash or Arctic Fox lines. The problem is there are not a lot of those in the northeast. After searching all over New England, yesterday we bought a 2003 Arctic Fox 26J. It is a one owner and in excellent shape except for the linoleum cracking this past winter. The original owner is downsizing to smaller Arctic Fox.
Thanks for all the information and suggestions. I'm sure you will be hearing a lot from me in the future :)
Frank