Because GM is not in a "best in class" pissing match like Ram and Ford are and I commend them for it. Just because your truck can tow 30k at the minimum 35 mph using J2807 doesn't mean that is what you have to rate your truck for. Using a higher minimum speed limit like 55 mph will make your tow rating lower than the J2807 standard, but it is a more reasonable speed at which most would prefer to tow and many will respect that. It is only the fan boys that are concerned with "best in class" and care about the highest tow ratings possible even though they themselves would never tow that much. This is coming from a Ram owner who also prefers a Ford over GM.
