Tire pressure is a function of the weight on each wheel position and the tire(s) on that position. There are weight pressure charts available for most of the major truck tire brands on the internet. If you don't have those for your tires, post the size and brand and I will see if I can find a link for you. Your coach probably came with Bridgestone 11R24.5" tires.
Without knowing the weight on each wheel position you are shooting in the dark. If you don't know the weight, use the Newell recommended tire pressure for each axle. The GAWR's are probably 13,200 front, 22,000 drive and 10,000 tag. If you are running Load Range H tires and you are within the GAWR's Bridgestones' chart shows a MINIMUM of 105 psi in the front tires, 100 in the drive axle tires and 85 in the tag. That assumes that the load is equally balanced between the right and left tires. I suspect that Newell recommended greater pressures than that. Newell recommendations for mine are 120, 110, 100 respectively and that is what I run.
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