Take a comparison measurement on a rear tire. For towing or hauling, adjust rear pressure, not exceeding maximum pressure, so that the rim-to-ground height is 3⁄16 inch greater than the front. With camper and trailer tongue weight, we estimated this Super Duty’s rear load at 7,563 pounds, or 3,782 per tire (not including any gear in the camper). An LT-metric tire would be better suited for towing/hauling here and would likely increase fuel economy by as much as 1.5 mpg due to less rolling resistance. A “plus zero” swap to LT325/70R17s would only raise LCC from the current 3,000 pounds to 3,195 per tire. A better comparable-height tire would be LT325/60R20/E. It has a 3,750-pound load capacity at 65 psi.