We have always "parked" the RV with the jacks down.  If nothing else, it stabilizes them in the event of wind, and it might even help if one of your tires went flat.

Terry

Check with your owner's manual about the slides. Most companies tell you to level, then put out the slides, which makes sense. There are a couple of odd-balls, though, that have published the opposite - put out the slides, then level. That doesn't make sense to most people, but if that's what the factory says to do, that's what you should do. If you are going to stay hitched, then you need to be sure that you are level. If you are only a bit nose down your front jacks can probably get you level, but remember that when they raise the front of the coach they will be raising the bed of the truck, too. Unless you have a true hydraulic leveling system (Big Foot, Quadra Foot, etc.) you can't raise the rear of the coach - you can only lower the nose. Just like on your Airstream, the rear jacks are stabilizers only and not meant to raise the coach.

Check with the tire manufacturer about what to do with the tires. Many people recommend that you park on wood or concrete rather than rock. Others say it doesn't make any difference. Some people would take the tires off if they have a hydraulic leveling system, while others leave them on all the time. If you leave your tires on be sure to cover them with those white (not black) tire covers.

Checklists are good things. Most of the things we have on our checklists are because someone forget that item. One family actually had "count kids" as the final item on their checklist because they once drove off minus one of their seven. It wasn't until one of the kids asked permission to move to the empty seat that they realized they were short one. When they got back to the campsite the missing child was waiting for them. He had gotten in the car, then decided to get out and go to the bathroom.