2008 Hummer H2 Owner's Manual - Page 148

All-Weather Cargo Area (SUT) Your vehicle has features to help it resist the elements and protect cargo inside the cargo area. Even when the water management system is working properly and the cover system is on, there may be some instances (heavy rains, automated car washes, etc.) when water may be present in the drain holes. See "Cargo Area Floor Drains" later in this section for more information. Side Rail Channels Removal and Cleaning To ensure that the water management system performs properly, be sure that the midgate, tailgate and cover system are fully closed and that each element of the water management system is clean and not blocked with debris. Follow the instruction given next in this section for the proper procedures on cleaning each item of the water management system. The side rail channels are located on top of both sides of the roof and the cargo area. You may want to flush them out with clean water if you notice any debris collecting inside of them. When loading cargo into the cargo area, be careful not to damage the rails. For more information on this feature see Luggage Carrier on page 2-65. 2-66