TM 55-1425-289-14 noticeably affected by the placement of heavy-lift items; therefore, ROLAND missile system equipment should be loaded in manner to counterbalance variations in the locations of centers of gravity from true center. b. Shoring. Shoring is not generally used beneath vehicles equipped with rubber tires. Frictional forces between the tires and the deck are sufficient to make it unnecessary. However, deck surfaces should be dry and free of grease or debris. 6-10