Not sure for the E series, but for cars and pickups, there is generally a disclaimer for the towing capacity that you may have to reduce the tow rating by any "options" added to the vehicle, plus the tow ratings are intended for flat terrain in moderate climates.
Towing in severe climates or hilly terrain and the tow rating goes down.
One thing is for sure, I used to tow a 6,800lb boat with my Dodge RAM 1500 (8,000lb towing capacity). The boat actually weighed more than the truck, and I had to be careful when going around street corners that as I slowed down, I had to make sure I did not turn the wheel, as if I did, I could feel the boat pushing the rear end of the truck forward.
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