I add the 5 psi , partially because I don't have a four corner weight.
If my coach is heavy on one side; something that axle weights alone can't tell you; then the extra pressure should ( hopefully ) be enough to compensate.
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99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
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