Thank you for going to the effort to report on the Power Twin II and I look forward to more comments. The Lippert equivalent does a poor job of stabilizing a TT when set up. I looked into getting the UF ones for our new TT but it looked like there would have been difficulty in retro-fitting them to our frame plus I wasn't convinced it would be much better, if at all, than the Lippert elec. stab. jacks that came on our TT.
According to the UltraFab website, they state that theirs stops front-to-back and side-to-side motion. I am skeptical how much better they are compared to the Lippert design since they look very similar. Does the UF one perhaps have thicker steel and stronger parts? I also wonder how well it controls vertical movement which UF doesn't mention. I'm resigned to the fact that I am going to have to get a set of cross-bracing stabilizers like the BAL Strongarm ones.
Also, the UF stab. jack is not self-levelling and you need a switch for each of the two motors. Not sure that would work for me and I don't like the idea of the jack being able to lift the frame. JHMO, but I don't think it's good at all to be lifting the corners of a TT frame, esp. if you have one of the weaker design frames that are on some TTs.