The box is now 21' long, 8.5' wide, 8' tall in front. I'm building it with the intentions of hauling 2 drag bikes and a scooter, so approx 1200 lbs. when not pulling a trailer. I also built it with the intention of pulling my Drag car when it's back together and my boat. I plan on pulling with a weight distributing hitch.. The picture has the hitch appearing lower than it is due to the dual pitch of my driveway. Bottom of the hitch tube is 13" off the ground when level. This is still low, but it's what I wanted for the dragbikes, as they are 2" ground clearance.