Welcome to the group. This IS the place to ask your questions, but there are NO dumb questions. We have all had to ask so we could learn.
You said you are getting a 1991 T-1550, where is it currently ? As for owners manual, nothing really existed, just literature about the individual appliances in the trailer (Fridge, Furnace, Water Heater). You can check up in the files section of this site and you might find what you are looking for, otherwise, just ask what you need to know and someone on here will probably be able to help you.
Sunny #18 2003 F-344SR #8157
Sunny #19 1997 T-2653 #5485
1999 Ford F350XLT DRW Crew Cab, Long bed 7.3 PSD
2002 VW Jetta TDI.. AKA: Kitty's Kruiser