I think we're all wasting our time with this one. First off, he wasn't asking for any advise, perhaps he already knows far more than the rest of us.
The OP's use of the word "fancy" to describe a WDH should tell us all he has no plans on ever using one. It's probably just something us city slickers waste money on.
Everything in the OP indicates the need for a proper hitch setup as well as him recognizing problems with the rear squat, like "moving the water next time" or stiffer springs, or thinking he's driving a car.
There are people on this forum with THOUSANDS/YEARS of towing experience and over ten years of posting on this forum trying to help others, but what do we know?!?!