I don't have a Ford, but here is how I approached it on my 2017 truck. The manual states that the recommended tire pressures (33 Front/35 Rear) are the minimum pressures required to handle the maximum rated loads. The tires state on the sidewall that the maximum cold pressure is 44. Since I am under the maximum axle loads when towing, I run 35 in the front and 38 in the rear. That has worked great so far, and we did a 2 month, 8300 mile trip this summer. The truck handles well and the tires aren't showing much wear.
"A good traveler has no fixed plans, and is not intent on arriving." - Lao Tzu