What load range tire do you have now? My guess is it's a "C" rated tire. My suggestion is investigate your rims, if they are stamped for at least 65psi I would change to high pressure stems and then go with Maxis load range D tires.
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2016 36FBTS Pinnacle
2016 F350, 6.7, 4x4, DRW, long bed
B & W Companion 5th wheel Hitch