rbpru wrote:
I think the weak link in the towing chain is the truck's hitch strength without the tow bars.
As shown above, there is a 10X difference between the WD and no-WD towing weight rating.
This has little to do with how much weight your truck can carry.
The 10X factor is also found in some of the hitch manufacturers set-up instructions.
Those are the numbers, the choice is up to the individual. There may also be some State towing regulations to consider.
Good luck
OP doesn't state what yr of F350, but even our 2013 F250 has 6,000/600 without WD, it HASN'T "failed" when towing my 10K GVWR flat bed trailer loaded without WD and that truck has over 100K miles on it.
With 4,100 lbs of cargo on the OPs F350, I also suspect it IS a lot newer than 2013 AND Ford made 2.5 hitches STANDARD on F250 and F350s after 2013.. Heck my 2020 F250 has 3,800 lbs of cargo capacity..
Fords hitches have always been pretty robust, not like the cheap ones GM used for yrs that used round tubes and the bumper..