When you takes your supers off in the beeyard you place them in a drip tray in the truck. Then return to the honey house to move the stack of supers. This accomplishes several things, no contamination of the supers from the truck bed, no messes in the truck and no carrying of one or two supers at a time. you can wheel the stack into the honey house, wheel them to extractor, extract, transfer them to another drip tray and wheel them into storage. When supers are needed wheel the stacks back on the truck to put back on the hives. The opening on the bottom of the tray is 16 7/8". which will accommodate most hand trucks. Save your back...get a Drip Tray.