For whatever reason the Weber Genesis Storage Box on the side comes with mounting holes for 2 trays but only comes with 1 tray….
Maybe they had the intention of selling an extra one? but they don't sell it…
Why waste the space, here is a STL file that will work perfectly.
Print with 4 walls, 100% infill, tree supports only on the attachment pins.
The author marked this model as their own original creation.