1. Don't leave one tire hanging in the air. Unless your parking the TT for extensive amounts of time, an inch difference between tires probably won't be a problem. If you're raising one side of the TT up significantly, support both tires; if you're only raising it one block (one inch), then do what makes you comfortable.
2. Stabilizers are meant to stabilize the TT. A TT is like a seesaw - doing a balancing act on a pair (or several pairs) of wheels that are placed centered or off-centered underneath. That means that the TT is going to want to teeter as the weight distribution changes (you walk from one end of the TT to the other, etc.). The stabilizers help to keep the TT level (aka not teetering) by bracing the ends of the TT so it can't drop down with added weight.
3. See above. Stabilizers are meant to help KEEP the TT level while moving around in it, not to actually level the TT.
4. You should be leveling your TT first using the blocks/boards and tongue jack. Once the TT is level, then strategically place the stabilizers in the corners to prevent teetering. You should never have to lift the TT with the stabilizers (I made the same mistake in the beginning).
5. TT and vehicle axles are built to support the weight of the TT/vehicle. Unless you're using the stabilizers incorrectly as levelers and taking the weight off the tires and axle, no damage should occur to the chassis.
6. Again, you're not jacking up the tires with the stabilizers. The leveling of the TT is done by using blocks/boards to raise one side of the TT. The stabilizers should not be raised/extended to the point that you are taking the weight off the tires. The tires should always be bearing the weight of the TT (unless you're changing a tire, etc.).
You sound like I did when I started. I had made it all so complicated and spent an hour trying to level the TT. Then I figured out that my thinking was all wrong. The blocks/board level the TT. The stabilizers just keep it from teetering like a seesaw.
