Maybe getting a little off-topic but relevant I think...
Our TT has a heavy duty frame. I-beams are 8" high and has 3/16" steel compared to the standard 6" beams made from 3 pieces of 1/8" steel welded together. The deadbolt in rear entry door would refuse to work sometimes. Finally figured out that when I tightened the stab. jacks a little too much, the frame bent enough to rack the door frame. Removed the latch plate and filed off about 1/16" downward which solved it. Had it at the dealer to fix it and they could find nothing wrong (not surprising). I couldn't believe a HD frame would bend that much and I only just lightly snug the jacks up.
Standard frames are going to bend way more than TT owners imagine. Put a string line under a beam and see what happens when you jack the corners. That movement in the frame is not good for the superstructure either, esp. if aluminum framed.
I see that KZ is now providing Lippert's ground control automatic leveling as standard on their Spree TTs. No way would I want this on a TT if the jacks are lifting at the 4 corners (which they appear to be in KZ photos). Besides, too complicated and more to go wrong (esp. being Lippert).