Here is a photo of the pallet forks / utility box that I use as a ballast box. I purchased the fork system and Freedom Hitch and built the utility box. The forks slide into channels under the box. It is very handy and serves as a small "pickup" for hauling firewood, tools, fuel, garbage cans, etc. around my property. I place front suitcase weights, old cast iron slabs and steel plates on the floor to provide enough weight for ballast. These weights are removed when hauling mulch or soil in the box. The box is 54 inches wide by 30 inches long and the removable sides are 22 inches high. The yellow racks in front of the forks hold rakes and shovels.