I can see you're not getting much help, and that is probably because they never were a large volume builder, and there are not a lot of them around any more. But I think it depends upon what you're going to do with it, compared to what kind of shape it is in; e.g., has it been sitting for a long time, is it in decent condition, maybe needs a little TLC, possible a lot of work, etc.
To sell it, it obviously needs to be clean, and most systems operating. The bad news is that you may have a hard time selling an older coach that wasn't one of the major brands, so you can't afford to put a lot of money into it. Elbow grease, at least, can make a significant difference.
If you're going to keep it for yourself, lack of manuals need not be a huge problem. Virtually all of the systems are made by other manufacturers, each of whom specialize in their specific areas, including chassis and, obviously, engine and tranny. You should have no difficulty finding an experienced RV tech to spend some time walking you through the operation of each of the various functions. Heck, you may find it really is fun!
Whichever, good luck to you.
Ken & Carolee, 1994 36' Pace Arrow/Ford 7.5L, Mobil 1 full syn & Banks Pack. Towing a 1999 Saturn SL2 with Roadmaster Sterling All-Terrain & Brake Buddy.