I RV travel full time towing a Lance 2385 (24') travel trailer with my 2007 Ford Expedition 4WD XLT Short WB. The Lance 2385 weighs 4,700 lbs empty, rated 6,300 lbs max. If I towed the trailer at the max weight of 6,300 lbs (which I don't) + 6,000 lbs max weight of the 2007 Ford Expedition =...