Hmm, tire load sticker on the door says 45 front / 60 rear.

DMAX guys on this forum seem to say 55-60 all the way around unloaded.

That true for the Suburbans as well, on stock size Toyos?

Well 50-60psi will give you a nicer ride, It really depends on the tire rating, it will be molded in the sidewall of your tires, E ratings are usually 90psi cold maximum pressure. ( I run my tires all the time at 85psi so I dont have to fill them up all time for towing, ect:D) Hope this helps.