Modify Your Charging Station Tower for Smooth Mobility from Room to Room This heavy-duty caster set allows you to roll your Tripp Lite CST20AC charging station tower from one room to another, rather than mounting it to a wall. The CSTCASTERKIT20 includes four casters (two swiveling) designed for smooth rolling between locations, even through doorways and across carpeting. It also comes with a locking rear door, two handles and a sturdy wood mounting platform with pre-drilled holes for the included mounting hardware.