If the load range of the tire is correct for the weight of the vehicle-with a Suburban I'd say battle tank
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- there should be no harm in increased tire pressures . If disgression is used , that is .Try 80% of max sidewall first then bump it up 2-3 psi a tank fill to owner satisfaction or within 20-30 % *over* max sidewall . This is my personal way of testing and not a recommendation to *just do it* without owner attention .