FWIW, my E350 (12 passenger, not the longer 15 pass like GA's) is not the most cushy thing in the world to ride around in empty either. It helps to lower the rear tire pressures from 80 for towing down to 60, but not much. Then again, it basically goes to the track or to The Big Orange Parts Store or it sits so the tire pressures are usually just left up there at "granite."

I may have to take it to North Carolina in two weeks (empty) to bring back some parts and I am not looking forward to it. My dentist and nephrologist see it differently and are planing lavish vacations accordingly....