My Duramax buddy prompted me to look up my rear axle on American Axle's website. Their spec sheet on the 1150 that I have in my '03 SRW 3500 says it's GAW is 4950 Kg converted to 10912 Lbs. So if I'm running 19. 5 4500lb load range G tires and 4400 lb vision wheels, then what is my next weakest link? I know the door sticker is stamped at 6100 lbs GAW rear. the D-max buddy pointed out that was the max load of both rear stock tires.