What is the interior size of the box? - 19.29” X 12.60” X 13.58”
Are there compartments, dividers, straps, etc inside the storage box or is it just an open box? - No compartments, dividers, straps. Only one open box with tray and the box lid.
Are there straps or other type fasteners to stack and lash equipment on top of the box? - No straps or other fasteners to stack equipment on the top of the TB. There are side latches on the top lid that enable to connect Toolboxes from the System series.
What is the load rating of the wheels and what is the dead weight of the box? - The load capacity of the 2 wheels is 154 lbs gross weight. The load capacity of the DWST08250 is 88lbs Gross weight. The DWST08250 weight is 20.94 lbs.