I am going to try a WDH when I tow, BMW says no but I am going to do some testing.

Either way 600 is the max tongue load so level or not this is what we have to work with, I have been towing my racecar with trucks for years and there is a bald spot on the trailer from the tire being in the same place for so many years. I tried this setup on the SRX before I sold it and I think I would have ripped the receiver out of the sub frame before the car would take the whole weight, so like you I moved the car back and it was fine.

So after all that said, I am going to do a "partial" self leveling upgrade, I don't have time right now so it is in a holding pattern, but the RV show is at the end of the month so depending on how that goes it may move to the front of the line