Welcome iconoclast,
There are several brands of camper covers, some brands have generic sizes or they can create a custom cover for any brand camper. The generic cover has certain fixed camper widths and lengths they fit, each brand may have different lengths. In this case, you pick a cover that fits in the range they offer. The excess length of the cover, most times gets gathered up and strapped up many times at the front of the camper. Zippers are abundant in some of them to allow you to get into the camper when the cover is on. (just to service something inside, not to camp with)
A custom cover, they would make the cover to fit to your length or width camper. The brand of camper does not really matter, you can tell them your brand and model, they may have a chart and can look it up, or they will just ask you for the dimensions of the camper and they will create one to fit.
Something else, your 1981 13 1/2 RD is a 6' 3" wide body camper, many of the newer campers are 8' wide. You will have to search for both length and width and not accidently get an 8' wide cover as that will be way too wide.
These posts talk to some of the brands out there. Some things to remember, get a fabric that breaths, but yet is water proof. Get a fabric for your region. Consider this a place to start, you may end up calling the companies and see if they offer the smaller widths. Now a days, small campers are coming back, so this may not be as hard to get, it just may be a custom cover.
https://www.sunlineclub.com/forums/f...ver-20261.html
https://www.sunlineclub.com/forums/f...ver-20518.html
Maybe one of our other members with one the smaller width campers can chime in on what they bought. I have only bought the 8' wide ones.
Hope this helps
John
PS, covers may only last about 3 years, some ,more it all depends on wind tears or sun deterioration or both. And then there are grades of some brand, the more cost, the better the warranty, life span.
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
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