Ours is on a permanent site year round.
From April to September we use the trailer on weekend and holidays.
During this time period the slides are always out, no sense bringing them in and out every weekend. My thought is needless wear and tear on the motors.
I will go up every once in awhile and sweep them off.
From September to April we do not use our trailer so we close the slides. Close them up and out of the elements of snow, ice, melting and freezing and cold.
Actually we only move the slides twice a year. Slide them out in the spring and slide them back in, in the fall.
07- Classic 2500 LT CC 4x4 SB Duramax/Ally
13-320RLT Crusader TE
Reese 16K Kwik Slide/Prodigy brake contoller