Well, I have to add to the above. If it were me, when not there, I'd put the slides in. For a couple of reasons. You'll keep debri off the slide roofs and not have to worry about what's up there when bringing them back in. If you have slide awnings, you don't have to worry about a bad windstorm coming up and damaging them. We keep ours parked at out house and may leave the slides out for a couple of weeks because we're going in and out, but since we're there, we bring the slides in if a bad rainstorm or windstorm is expected.
As with any mechanical part, using it is important to ensure it works correctly.