At least a couple of PSI above door sticker rec. for full load, some times even more. Had 2 cheap-ish new Falcon ZIEX wear out on the outside edges in 1/2 a year with 2 PSI above, so got them replaced under warranty and still run them with 4 PSI above rec. Same with winter tires, oops!, meant tahrs - hard, solid ride as it should be ;o)