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Your owner's manual explains in detail how to calculate the truck's max SAFE trailer weight, considering optional equipment, cargo, passengers, & other factors. If you don't have one, get the closest year here:
https://www.fleet.ford.com/maintenance/owners_manuals/default.asp
But the short answer is: NOT MUCH. Without a load of cargo in the back to hold those tires on the ground, the truck isn't heavy enough to tow its own weight safely on the highway. And with a load in the back, the leaf springs are so close to capacity that you can't put enough tongue weight on it to balance a substantial trailer. I've towed some big stuff with my Bronco, but it has much better weight distribution than a pickup, and I had it set up for hauling. Even so, I rolled it by hooking up to a trailer that wasn't loaded correctly, despite it being MUCH lighter than some I had towed with no problems.
So there are MANY factors involved in safe towing, and YOU are the biggest one. If you haven't towed much before, don't learn close to (or OVER) the truck's max. Tire construction & pressure are more important than engine size.