Don't do. The Expedition is too light.

I wouldn't even attempt an enclosed with my F150 Super Crew.
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Too light? I've towed 1000s of miles with a 20 ft enclosed and my Lightning. No problems whatsoever. Tows good, stops good, can't ask for anything more. Truck weighs about 4600 lbs, certainly lighter than a lot of rigs but I don't have a problem with it.

Heck think about the trucks they towed with 25-30 years ago - far worse than many of our med and some light trucks, but folks still did the same things they do today.

R