Towing Capability of Expedition

Short answer, stick with 6500lbs loaded max, or around 5300-5500lb dry. The Expy EL generally has enough payload with a family of 4 onboard to fully utilize the maximum tongue weight for the receiver. My yellow Tire and Loading sticker states a maximum of 1672lbs passengers and cargo. So with a 900lb maximum tongue weight at 13-14% is around 6500lb fully loaded. More and you are probably going to exceed the receiver rating and overload the rear axle shortly there after. This weight will also most likely dictate your maximum length, too long will probably be to heavier. I am very pleased with the performance towing my 22ft 5200lbs loaded TT with 6 people in the EL. I have a Reese Dual Cam weight distribution and sway control that keeps it all in line, and a Prodigy P2 brake controller. Good luck in your search!