There wasn't much info on a trailer like this, even when it was new. You may be able to find manuals for the stove, furnace, water heater, etc. online. Find their make and model and search the net for info - there are quite a few sources available.
What sort of info are you looking for? Company history? Specs? Instructions? Not likley to find any of those on an old, regional brand trailer.
Is it possible the manufacturer is Continental and the model a Brentwood? There are two large trailer manufacturers named Continental: Continental Trailers and Continental Cargo. Neither produces a travel trailer now, but may have at some time in the past.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL