Welcome to Sunline Owners Club!
It sounds like you have discovered water damage on a camper you where told was OK. This was unfortunate it happened. Many times the prior owner may have not known they even had a problem even. We can help but we cannot see what you are up against. If you can post some pictures they go a long way here to help explain the problem. The key to a water infection fix is to make sure you found the leak source before doing a lot of repairs.
We may not have your exact model that has gone through a water repair but we do have many that have done water repair and the repair techniques do apply regardless of floor plan.
Rich mentioned searching, this Google Custom Search for our website will help better then the embedded search engine on our site.
When you click on that link, scroll down to the search box that says "Google Custom Search" Enter few words like "rot repair" or "water infection" and hit the blue Go button
Here are few of the repair posts active and ongoing now.
This is a 1987 T1550 http://www.sunlineclub.com/forums/f7...air-17458.html
This is a 2004 T1950 Restoration project camper, http://www.sunlineclub.com/forums/f7...avy-17684.html
This is a 2007 Que http://www.sunlineclub.com/forums/f7...ent-17596.html
A 2000 T2653 http://www.sunlineclub.com/forums/f7...3-a-17433.html
A year 2000 T2363 Sunline http://www.sunlineclub.com/forums/f7...rra-17697.html
A 1988 T2980 http://www.sunlineclub.com/forums/f7...elp-17654.html
And this thread may help with searching the camper for where the water infection stops and starts. http://www.sunlineclub.com/forums/f7...per-17613.html
Hope this helps.
Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club