I have a 2015 Vista, from an exterior cover standpoint it’s pretty much identical to your LX. Mine is 36.5 feet, this is what I have used.
https://www.rvupgradestore.com/ADCO-...-p/00-3865.htm
It’s on its 4th Vermont winter and is doing well, couple of small tears primarily from the slide topper hardware. Easily patched with the patch kit (although one spot did get an added layer of gorilla tape this year). You can still access the coach in the winter with this on, I usually pop in a couple times a month to check my mouse traps and dream of summer.
As others noted, snugging it down properly is the key. It can be done one person, but a LOT easier with 2.
May find cheaper elsewhere, but when I bought that link was the best deal around.