The Double wide Caster Base will accommodate 2 Cubes of any style side by side. And allows you to move your CUBEs without having to lift. (Adds 3.25" to CUBE height.)
The Triple wide top and base will allow for a continuous top across 3 cubes. For a TV stand or what ever else you desire to place on top of the unit. (Because of the size to weight ratio UPS calculates the weight at 60 pounds.)