elcome to the forum and congratulations on your new rv!!
Suggest visiting Camping World on-line https://www.campingworld.com/search?...=&lang=default
as they have many options and will warrant / replace their cover in the event it shreds during high winds. Be sure to mearure your rv. Look for one one that is uv resistant and reinforced at the corners and wherever there are protrusions to mitigate tearing. There are many options depending on weight, warranty and budget
. They can be very cumbersome to install so suggest having some help and be careful not to step on your roof vents during installation.