The pressure on the door sticker will handle the Gross Axle Rating. More pressure won't increase the axle capacity.

I run 700+ pounds of tongue weight via an Equal-i-zer weight distribution hitch and find an extra 5 psi on the rear tires takes some of the squirm out of the rear P-rated radial tires on the Expedition.

Make sure your trailer tires are maximum sidewall pressure and your front suspension is lower with the trailer hooked up than not. Otherwise your WDH ain't working.

We're about 25' ball to spare tire.



-- Chuck