What I need to do is mount a cargo platform on the hitch receiver. The load and carrier will weigh about 370# and the center of gravity of that combination will be about 24” behind the vehicle. I can calculate how the weight on the front and rear tires will change if I have the car weighed. Here’s where it gets trickier. I will be towing the Expedition behind my motorhome so the engine won’t be running. Does it have to be running? How does the load leveling suspension work?