Every guy who said 1/2 a yard is exactly right. I haul gravel all the time, always 1/2 yard at a time. The most I have hauled in the back was 2000 pounds, that was scary, very wobbly side to side. However, you can get a double axle landscape trailer and haul the hell out of it. A guy came on my property to get some wood last week with a toyo truck hauling a double axle dump trailer with a tow hitch, hauls 5k pounds with ease. You can get a brand new double axle DUMP trailer for about 5 g's, less then you would lose trading in your truck plus you would have a bad ass trailer.