I can remember things a bit better if I have a reason for WHY they want it done that way.
Maybe thins will Help you also?
Both jacks and slides are big power users, so to get them the best power we start the engine first as a way to help make sure they have enough battery power.
Then we want to put down the jacks as that makes the RV more stable and less prone to tilting as we put the slides way out away from the body. If we put the slide out first the whole RV does tilt more as we stick that weight way out and then when we are trying to get the RV level, we sometimes tend to twist the body more and that's better done with the slides in.
So the opposite is true when we pull them in. Rooms in first, then jacks and always have the engine running to get good power to them.
One big thing to avoid if somebody wants to help? Don't let both happen at the same time! Too much thumping, bumping, and twisting is not good for the slides.
I like to have things as simple as possible!
2015 Winnebago Vista 31KE on 2014 chassis