Welcome Alex! Per the VIN, you do have a 1985 Sunline C-700 truck camper, the smallest truck camper made that year. You can download the brochure in the files section of this site, which contains all the specs on it. You can also find some various owners manuals for the appliances in it there too.
Based on the VIN, it was likely built in the fall of 1984. I'd have to check my records closer to guess a month.
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