I'm using this on an older model Solaris Sunliner and it fits well. The sizing is fairly accurate, but does have a little wiggle room. I wish I could say this was a breeze to install, but it absolutely wasn't; in it's defense I've gone through about 5 covers over the last 20 years and none of them are easy to install solo. This one comes with a lot of little extras, which is helpful. I had quite a few concerns about the material when I first unpacked it, but we've gotten a bit of snow and it seems to be holding up ok, and while I know for a fact my RV has leaks, the cover is doing it's job and keeping the water out from even getting to the leaky roof. I love the zippered rear panel. The design of this cover is a lot more versatile than any I've used in the past.