Thanks for all the comments and insight, but I should point out that I'm not buying this hoping to take it camping this summer. Having done some fairly extensive rot repair on out 34' TT just last year, I know only too well that you only see about 25% of what's wrong. You only see where the water came out, not where it's going in...
I am optimistic because the inside is bone dry with no water stains at all, and even the other outside storage compartments are dry. I've never worked on a TC, but if they're built like wood framed TTs, it can't be that hard.
This unit is sitting in a storage yard costing the owner $75/mo. He just bought a boat that's going next to it in the storage yard, and apparently the wife said NO to paying $150/mo, so he is giving the camper away just to get out from under the storage bill so DW will let him keep the boat. He got it with the intent of repairing it, started taking it apart and never got the time to finish.
So I'm going ahead with the deal, meeting the guy this weekend to get the paperwork and I'll pay for 90 days of storage for the unit to give me some time to get into the details. If it's fixable like I think it is, I'll rent a trailer and bring it home next month. If it's too far gone like some of think it may be, then I'll repost it on the local camping site where I found it as a "free - come and get it".
I figure since these campers cost $50 g's new, it's worth $225 to check this one out. If it's a total loss, I'll be out my $225 wager and will have never brought it home. If I think I can fix it, I'll bring it home, put it in the garage and see what I can do with it.
If it takes me 3 years to fix it, that's OK, we have the trailer to camp in, and gives me more time to shop for a truck.