Well, I know that it's not much...but maybe this might be some help to at least see some of the options that were available?
There is an 8298s that's a 31 footer...sound right?
From there, a lot of times, you can order some owner manuals from the manufacturer. I've contacted their customer service department and was able to get some pages sent to me concerning a repair for the lift system on an 86 rockwood popup trailer i own. So maybe talking to them will help? Let me check my email for the contact I used...
Stephanie Little (firstname.lastname@example.org)
Her number is 574-642-2640
There's actually several phone numbers for the Forest River Manufacturer...so to make it easy, here's a link to those numbers: http://www.rvusa.com/rvmanuf2.asp?type=5thwheel
Hopefully you'll find what you're looking for.
We just bought a 2k M-18, which is their hybrid trailer...old, but in awesome shape.
Where we've been:
2000 Rockwood Roo M-18 Hybrid
2006 Dodge Ram 2500 Auto 5.9 Diesel
Gone but not forgotten -1986 Rockwood 1003 PUP