We figured out mine at work, if you take the gvwr minus the payload rating, that is how much your truck would weigh with out accessories and whatever that was added on. So mine came in at 4750. But course, that can be wrong. So yeah, they aren't that heavy for a big truck. I found out a hummer h3 is rated at 4850. Thats heavy for something smaller, skinner than ourtrucks, and is powered by a 220hp 5 cyl. No wonder it is so freaking slow. It took 11 seconds to get to 60 and 17.7 for the quarter. That was in motortrend not to long ago.