What pressure for LT tires

There are many inflation tables out there, but they share roughly the same inflation schedule dependent upon the load you plan on carrying. Your truck most likely came with the "P" series type of tire, which achieves max load capacity at 35 psi. Your LT tires will require more pressure to hit the same load range. So go find a tire maker's LT load table and select the load rating closest to what your OEM tires were. For my F-150 that I owned previously, my OEM tires were rated to 2,400 lbs per tire (P275/55R20). So I looked at the LT inflation matrix for Bridgestone (I actually bought goodyears, but the inflation tables I've seen are the same per tire size across all manufacturers I've looked into). In my case, that meant running 45psi to maintain the same load capacity.