I'm going to bundle answers here rather than answering individual posts:
1) Yes, the coach is as close to level at this moment as I could get it manually. So says the bubble level.
2) The driveway has a 1.5 - 2 inch drop across 20 feet laterally (it's one or the other, but I cannot recall which the contractor chose when I had the driveway installed) and less than 1" across 20 feet lengthwise.
3) msmith1199 has hit on what I suspected was part of the issue, i.e. the MH cannot "pivot" on the axles in the same way that a 5er can. That being said, the issue seems to be side to side, rather than front to back.
The system tilts the coach a lot towards the passenger side, then says that it's unable to level the coach. However, the passenger side is towards the lower portion of the pad, which leads me to believe that there's something not quite right in Lippert-land with the system.
I had similar issues with the system on the 5er due to an improperly installed fuse impeding functionality. I have a call in to the dealer so they can try to help diagnose the issue(s).
As things stand, if this system cannot level the coach on my driveway, then it's not going to be useful at many campgrounds, IMO.
Thanks everyone!