We have a Heartland MPG, and a Nissan Pathfinder with a 6,000Lb tow capacity for a TV.
With the MPG hooked up, the back end of the TV drops about 2", and the front goes up about 1/2"- 3/4".
Since the MPG is only 3,800 GVWR, I had a dealer tell me I really didn't need a WDH, but an "E2" would...