On my unit the first thing I do is release the air bag pressure, lower the jacks, extend the slides. When leaving, start mh, pull slides in while the pressure is building in the airbags then retract my levelers. Of course since they are Power Gear I never know if they are going to work.
Jim with Judy
08 38' Bounder DP
Toads: 08 Jeep Wrangler Sport; 11 Chevy Malibu