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Keep in mind, this was at the time that all ST tires were rated at 65MPH and what was being installed on trailers, often didn't even have a safety margin, as trailer manufacturers were derating axles to meet chinese tire maximum load ratings....
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Race car towing people, complaining about tire issues. And same person passes me going 80 on the way to the track. Dude, read the sidewall.
Overload pulling - guilty. The old 1993 F-350 DRW 7.5L gas was used to pull our 34' bumber pull. I guesstimated the weight at around 12~12.5K with the car in the box and 1500 less with the dragster. Truck is nominally "rated" for 12K. The truck liked to run about 62 down the road, that was where it pulled best. Finally after a few years thought to actually put the trailer on the scales. Oops - 13,500 and about 2000 hitch weight. That 75.L and E4OD didn't really care for the weight but it pulled it, even up decent grades. As of 2020, we moved to a truck with about 2000 lbs capacity over our trailer and way more drive axle weight rating. Still, I prefer 65-70 pulling anything. Not in that big a hurry.
Also saw the comment on the 3.5 EcoBoost trucks. Yea - ours pulls a 5600 lb Keystone RD without much trouble. But I'd not get far over that. F-150s all share the same issue - light in the azz end. Enough tongue to help a larger trailer pull well and it'll squat. Even with a 5th wheel or gooseneck the GWVR doesn't change much, nor the "max trailer".