If you get a full cover, and you have multiple slideouts, you will have to do something with the cover if you want to extend the slides while the cover is on. I've seen a lot of these covers that have zippers or velcro for the door (on the curb side) but don't have any of these for the drivers side. That's a major problem if you have two drivers side slides, like mine. I use 9X12 silver tarps. They extend just a few inches over the sides and don't interfere with the slides... . 
