After very long storage, what to check?

Thanks for all the great input. Here's an update. The air conditioner got around to cooling in its own sweet time and seems good and cold now. The fridge ended up okay on AC and will try propane today. The auto leveling jacks worked flawlessly extending. Getting them back up comes next. Both slides worked after spraying with silicon. The fresh water system just need a clearing out with city water (thanks again) and will get sanitized today or tomorrow. Both auto extending awnings worked with a little convincing. Still haven't tried the propane stove or the fridge on it, but that's today's work.

It's enough to do for the weekend, and if I can find a reservation anywhere in Northern California next weekend, we'll take it on the road. First time with new family. Wish me luck!