Actually GM published their SAE numbers 2-3 years back but Ford and Dodge didn't so they dropped them after a couple of weeks. The biggest change was the 2500 truck had a 17k tow rating which was dropped to 15k. Big deal. The DRW and 1/2 ton changed little to none.
SAE numbers won't change a thing out here in the real world.
AS mentioned the important numbers from a safety stand point IMO is a trucks load carrying capabilities which the SAE numbers has nothing to do with. Non of the trucks GAWRs were changed.
I surprised GM owners/lookers don't use GM online ordering guide's weight calculator that gives the trucks actual payload on the front axle/rear axle and for GVWR. This includes all the std and options on the truck..... as it comes from the factory.
http://www.gmfleetorderguide.com/ IMO the truck GVWR payload sticker is useless. It doesn't reflect the trucks actual gross weight payload after the owner has added his equipment/hitch and necessary junk nor does it give a payload for the trucks drive and steer axles. This is where the clicky linky to GM online ordering guide can help with payload numbers. It gives a front/rear axle payload and a GVWR payload number.