I have noticed driving around that many people have their slides open while camper is not in use. Perhaps they are using them but I don't think so. Curious about opinions on this. I would think it ...
hondapro stated "Unless there is a chance of getting snow or ice build up on them". I agree with hondapro but-----
I had noticed that a local RV dealer this past winter had kept most of the trailer slides open during the winter with a build up of snow on each one. I might just stop in one day and ask "why?"