I used a cover one season for my 5er. It had a zipper to access the door, and I didn't think it was terrible to put on.
That said, we live in an area where we get a lot of wind. The ropes I used to tie it down ended up rubbing the paint off in several places. Sold it on craigslist after the one season.
2012 RAM 3500 Laramie Longhorn DRW CC 4x4 Max Tow, Cummins HO, 60 gallon RDS aux fuel tank, Reese 18k Elite hitch
2003 Dodge Ram 3500 QC SB 4x4 Cummins HO NV5600 with Smarty JR, Jacobs EB (sold)
2002 Gulf Stream Sea Hawk 29FRB with Honda EV6010