The design looks a little overly fancy. Too many perimeter small tubes. Less tubing and some expanded metal flooring. I like the mesh design type floors better. This way small items don't fall between supports and if something shifts it won't slip between or cant...also the mesh more evenly supports the bottom of your containers. The design doesn't show how big, or the placement on the trucks/toppers roof, of where the feet go. The more the better, the bigger the better and closer to the edges of the roof will provide the most durability without bending/fatiguing the top. I love gutter mounts for this sort of thing but you don't have that sort of option. In this photo the rack has 30 gals gas/ firewood and a big trash bag on it.
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Darrell