Have you ever watched a Truck Service Center inflate Truck tires?? The new tire and rim assembly are put into a cage before applying pressure, because the amount of pressure is so great if were to come apart it could kill the tech.
I would bet money it took more than 40 PSI to seat my 125 PSI "H" tires on the rim.
Those numbers and specs sure sound like it pertains to Passenger Tires not heavy Trailer tires.
Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.