I own a Aspect 30J and according to the manual it states to ensure the vehicle is level first, then extend slides. So the steps, in order would be 1. Make sure the vehicle is level (use jacks or blocks/ramps) 2. Extend slides. When time to pack up and go home, the logical order would be, retract slides then roll off blocks or raise jacks to become uneven again. If you think about it, many vehicles and or trailers, come with slides but not necessarily leveling jacks. Safe travels and happy trails.
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