My camper has held up incredibly well over the nearly 2.5 years and lots of use that I've had it, but the Arizona sun (and elsewhere) is brutal over time. The only thing I've noticed so far is a bit of cracking of the gaskets around the window/door latches, no leakage though. Partly my fault, as I missed those in my initial treatment with 303 for UV protection. The Maxxair fan, the PV cable gland in the roof and the roof seams seem like a longer term concern for sun damage.
So, last year I got a custom cover from Adco/Covercraft to go with the Covercraft pick-up truck cover I already had. Adco seems to be the RV side of Covercraft. Just put it on today for the first time as we were using the camper enough last summer that it didn't seem worth the effort to put it on and off a bunch. I'll be taking it right back off for a trip soon, but had to try it for fit. Maybe 10 to 15 mins to put on, and guessing a little longer to take off and stow.
It took a long time to make, but they nailed it. It's Sunbrella fabric and the quality of the whole thing seems exceptional and a lot better than the off the shelf pick-up cover from Covercraft I'm using on the truck cab.
I can provide more details/contact info if anyone is interested -- the custom guy at Adco was great to work with. FWIW, they keep a library of their custom work and now that they have the dimensions for mine, should make it easier/quicker. I'd bet a cover made to these same dimensions would fit any Ovrlnd camper on a 6.5' full size bed, but the dimensions can be adjusted. IIRC, the cost was around $380 but that was the fall of '21 when I ordered it. Took 'em 6 months at the height of the pandemic and supply/labor shortages.
The straps across the back are the only two showing, but there's 7 total -- two under the cabover (which also has a HD elastic edge in the front underneath), two in front of the rear wheels and behind the rear wheels plus the two in the back. All the attachment points for the straps are reinforced with heavy canvas/vinyl and have grommet holes as well, and the straps are quick connect buckles.
There's two zippers up the sides in the back with straps and velcro to roll it up on the roof to allow easy rear door access with the cover on.