Have just become full timers. First winter in motor-home , presently in NC. Have have temps in the teens for several days each week for last several weeks. Appears that a snow storm is heading our way...
I would say it depends on how tight things will be with them in. My 5er is a 40 footer with 3 slides, pull them in and you might as well go stay in the truck.
1-6 inches I'm leaving the slides out, the toppers will be ok and like already said the snow will probably be gone in a few days. Even if it did snow a lot more than 6in and it didn't go away in a few days you could always get a ladder and a broom and push it off.