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Ponch,
Tire pressure is best set on the basis of 2 factors, the pressure limits set by the tire / rim manufacturer and the weight you will have on the tires.
On my old Ford dually I set the duals at 50 - 60 PSI unloaded and then full up pressure (80 IIRC) when towing. I reduced the pressure for empty to ease the ride and to make sure I wasn't wearing the center of the tread prematurely.
Look at the tire and rim for max pressures. Weigh the truck axle for loaded and unloaded weight and check with the tire manufacturer for the recomended COLD pressure for each situation and fill accordingly. You already know the MS rigs are very heavy on pin weight. You should be able to find a tire inflation chart on the manufacturers web site based on model and load on the tire.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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