I did buy the Ballast box, but got stuck with an " adder fee" ? and extra shipping costs. When received I found the construction / design to be lacking. The cat. 2 side pins are in brackets that are welded only on to quite thin sheet metal of the box. The top link bracket is only welded to the top edge with no strap to the rear of the box. I welded a strap from the top link bracket to the rear of the box as I was afraid the top link would bend the box out from the load. I first filled it with only gravel , which overall is approx. 350 lbs less than concrete. In first two hours in the field the side pins were bending their mounts on the sheet metal. Now I take it back to my shop streighten the brackets and box and will weld a flat bar across the box and onto top of each pin bracket for reinforcement. The engineering of the box seems to be typical Chinese design. I don't know where it was designed or built though. Overall I doubt I buy Titan again for anything.