I don't know what your snow situation is, but if I was in an area where there was a chance of getting a good dumping of snow, I would run them in. If the snow is slushy and than freezes it could do quit a bit of damage. Also, if you had a layer of ice on the slideout roofs and wanted to run them in, you wouldn't be able to. I'm a lifelong South Dakotan so I've seen a lot of winter. I think you would have less of a chance of doing damage by running the slides in as opposed to leaving them out.
Roger & Cheryl Full Time since 2002, RVing since 1975 2008 Chevy 3500 Crew Cab Dually, 2012 RW 36RL