I got one of their prior Bag support racks that was steel . and added 3 tubes to the base to carry Boxes on It .

3 tubes 9" deep with a boss in the ends and a cross bar , that is screwed into that for the front.

(initially a 3/4 x 1/8 piece of aluminum, cheap to replace when it gets bent) ,

wide enough to be Useful , which I see that is Not.