Turning With A Long Bumper Pull Trailer

Just to point out one thing, tow ratings on any truck tested to SAEJ2807 standard (which is pretty much all trucks) are not based upon towing a flatbed trailer. The max trailer weight rating of vehicles is partly determined by testing towing trailers with Frontal areas that are a minimum of 40 sft for 5000 lbs trailers up to 75 sft for very large triaxle trailers. You don’t meet the standard for pulling a 5000 lbs trailer with 40 sft frontal area, you don’t get to rate your truck for that max trailer tow weight rating.
Clicky
Ford tells you what the max frontal area limitations for their vehicles are See pg 17