I think I would leave them retracted. It just seems like there's less risk and better longevity of the equipment if the slides are retracted than if they're out all the time.
It probably doesn't matter, but I think I would feel better with them in.
-2018 Greyhawk 29MV
-1997 Jeep Wrangler YJ (Toad)
-2015 Jeep Grand Cherokee Limited (Soon to be Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)