I but several bags of silica sand to keep everything dry - it worked well. The smaller totes sat on top in our largest storage bin. Our lawn chairs sit behind and atop the totes in the second tallest storage bay. This is also where the tool box and tool tote are stored. These are the items we need to access the most.
Many folks store their chairs on the back of their rig.
We haven't been able to find a reasonably priced holder that we felt was secure enough. We are fortunate in having a railing on top to which we can attach items. This is where our ladder is stored. Finally, the smaller storage bays are used to hold items that fit the compartment size. For example, one long, narrow bay is where we store our rolled up rug and our broom.