As far as the performance. Don’t hold back! Let it rev, 4500rpm isnt out of the question. Going up I70 out of Denver has me at 45 mph in 2nd gear at 4500rpm towing an Explorer with 2 bikes on the back. This was before the 5 star tune, and yes the 5 star time makes a huge difference in towing performance.
As for leveling, as long as the ground is somewhat level just level the coach manually with the leveling system. If it needs to lift a tire off the ground, then raise it past that point and put whatever amount of boards are needed under the tire. Then retract all jacks and relelvel.
On the storage, don’t worry. Eventually you wil fill everything and you’ll be trying to figure out what isn’t needed.
On the generator and having it running when disconnecting oe connecting. I’ve heard it’s bad to do it under load. Supposedly it’s bad for the contacts in the auto transfer switch. At the very least make sure any heavy loads are turned off.
