Sunlines of that vintage came with nothing more than a manila envelope with a few of the key appliance manuals supplied by the company who made each appliance. What are you looking for specifically? There wasn't a specific manual to locate things in your trailer or tell you how to operate everything inclusively.
2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9467.8 (as of 5/26/19)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR