I cover my 36' MH and have since new. It has protected my MH very well and I am glad I cover.
Most people do not for all the reasons you will read and they are basically correct. Out of 15 or so MH's in the same storage area there are only two covered mine and someone elses. My MH looks a lot better than the uncovered ones. I get my cover on and off by myself but it is easier with two people. There is some chafing which I rub out and I repair the cover occasionally because they do rip. I use an ADCO designer series and they breath just fine so I do not get mildew or moisture build up.
I am a seasonal user so I only remove and re install my cover maybe four/five times per year. If I traveled every month perhaps I would look at this differently.
Covers cost about $400 and last about five years.
I do all my own stunts
03 Dolphin LX 6355, Workhorse W22, 8.1 vortec, 04 CR-V, Blue Ox, Brake Pro----Norm, Barb and
Doc(He's a PhD)