Duh!!! I was thinking Explorer, not Expedition!!!
Never mind!!
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I was gonna say ... I mean, my '03 Expedition weighs about 5600 lbs withOUT people and cargo, based on the scales at the local dump ...

But I've noticed with a 20' enclosed that the engine has to work pretty hard at highway speeds to maintain 70mph. I've got the 5.4L and the 3.73 gears, tow package. But it's great with the open trailer. The newer ones do have a bit more power (3 valves/cylinder).