Permanent snowbird site questions

For leveling, what does the manufacturer say - - you need to follow their instructions because when to level is a function of how the rig was built and squared up. Some manufactures say level, then extended, some manufacturers extend then level. Follow their instructions.

I'd pull the slides in when not there. Just helps extend the longevity of those interior seals, plus streamlines the trailer so that wind/rain flows easier over the rig.