Diamond Mounting. This also uses two rigid and two swivel casters, but the 
              diamond shaped  mounting greatly increases maneuverability. The weight load is 
              dependent upon the capacity of the casters selected. This mounting is not 
              recommended for ramps.

              Four Swivel. Where a side motion is frequently needed, the four swivel 
              arrangement is excellent. If the casters are equipped with swivel locks, this 
              mounting is also practical for long straight travel as well as use on ramps. A most 
              versatile arrangement.

               Four Swivel, Two Rigid. This is a level mounting design for heavy loads and long 
               trucks. The two rigid casters help to distribute and reduce the load on the swivel 
               units and thereby maintain good maneuverability and easy steering.