While the front wheel well height changes are the key measurements, the other are also very important. What is the loaded, unloaded, and WDH applied wheel well heights?
If you return the front wheel well height to half or less with the WDH, great. BUT, if your rear is squatting down, it increases your TV angle front to back.
I also measure the height of the TT box frame front to back and side to side. I want my TT within an inch or so level for towing.
IMHO, the WDH should try to transfer the weight across the TV & TT and make them all push down on the suspensions.