I often wonder if anyone who posts on topics like this has ever towed a RV. These ratings are all smoke and mirrors. Sure a 1/2 ton can "pull" a 30 ft trailer but give me a break it wouldn't be safe to do this in a Walmart parking lot much less on the open road. I even saw one poster who was happy about not having to use an equalizer hitch because GM says it is not neccesary. I mean - so what if the back end feels like a sponge and cross winds shove you into the opposite lane or going up hills causes traffic backups because you can only do 30 miles an hour. These ratings make the RV manufacturers smile because they can say to the empty headed customers "you have a Sierra 1500 - sure you can tow this 32 ft fifth wheel just look at the GM web site". As you may be able to tell these "capacity ratings" get me a KindaCranky