As to the hitch, it will depend on what you are towing. Some measurements of the trailer tongue are in order, as is clearance through more than 90-degrees of swing.
The
TORKLIFT SuperHitch
Supertruss Extension may be workable. It's overkill for capacity, but the design is meant to clear a big truck [bed] camper with from two to five feet of extension. I'd contact them. Their reputation is high among truck camper enthusiasts.
You might also read Diesel Dave's explanation to me of BSFC maps . . similar to what I was trying to say in re road, load, etc., on
this thread. The Ford guys may well have dug up a better map for you. The more baseline work (mechanical condition and driver skill), the better the aero result, IMO.
.