The DW and I along with many others pull a 25 ft TT with an F-150, E-Boost and towing package. Stock tires, hitch, tyranny and rear end.
If your TV does not have the towing package, I would check into a transmission cooler and the rear end gearing.
Before I did anything I would try it as it is. You may find you are fixing what does not need to be fixed and missing something that does.
My previous F-150 had the towing package with all the bells and whistles but only a small V6. It did not take to long to trade up.