Like I said, my cover is an off the shelf unit from CampingWorld made by ADCO. I'm on year 2 and I might get 3, but despite my best efforts, some holes have appeared and the patching material supplied doesn't work. The workmanship was shoddy (crappy zippers and missing buckles) and since it is designed to fit a range of sizes, it doesn't fit mine very well at all.
However, It has done an outstanding job of protecting the finish, decals, rubber, roof, etc. of my motorhome. AZ sun, as you know, is brutal, probably worse in Yuma than in Sedona. The cover will work for you.
It sounds like either a trailer or Class A cover will work. Give Adco a call. Have some dimensions ready for them and let them guide you. See if an off the shelf cover will fit good enough.
Take Care,
Eric