GM twins now J2807 compliant
http://news.pickuptrucks.com/2014/06/2015-chevy-silverado-1500-and-gmc-sierra-1500-are-j2807-compliant.html
Forum Discussion
Well, not a huge change in the numbers; just a few hundred pounds on most of the trucks. So either they weren't as far off as everyone assumed, or there is plenty of wiggle room in the new standard.
