Oh yeah baby, you got one too.
The owners manual has a page on it explaining what the 9 or so empty sockets can be used for.
2003 Yellow H2, Lux Series, Air Suspension, Front Brush Guard, Rear Tail Lamp Guards, Roof Rack Light Bar, Helo Maxx 8 Chrome Rims, MC2 Chrome Billet Locking Fuel Door, MC2 Chrome Hood Handles, MC2 Chrome Hood Latches, Chrome Billet Hummer Logo Hitch Step