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With that level of derating, you have a whopping safety margin even if your brakes are nearly worn, if the trailer is not quite well balanced, and the tongue weight not quite right, or what not.
I learned my lesson the hard way when once, I towed a 7,500lb trailer with a vehicle "rated" by a maker (not Ford) for 7,000.
It was hairy -- and I kept monitoring the tires (which were squatting pretty low) and heating up during the tow.
From that time onwards, I slashed what the makers claimed by a lot... and enjoyed every one of my tows.
Especially when I pass by an overturned truck-trailer that clearly, was either at the towing limit or over.
> Perfect thank you, can't believe 3.54 only cost me 1000lbs. Might be worth a switch.
I doubt it, it is going to be about 10 mpg no matter what you have with the 460. The only ones I have seen get good mpg where EFI trucks with the 5 speed.