I don't know it's original intent, but it was the ideal place to route the rear view camera wires. I removed the outer cover, then the rubberized plug, and drilled through into the rear cabinet on my 8289WS. Also made a whole in the rubberized plug.
Ran the camera wire through to the cabinet, and then replaced the plug and outer cover, re-sealing the outer cover with clear silicone.
Picked up the 12VDC from the light wiring in side the cabinet by installing a switch and fuse.
Made for a clean, waterproof installation.
2013 Rockwood 8289WS
Mods: Central Vac, PI EMS-HW50C, 2025RV, (2) SCS225 Trojans, PD9260, Awning Remotes & LED Lights, Eliminators, External Water Filter,, Intellijacks
2008 RAM 3500 Cab&Chassis Hauler Bed, B&W Companion Hitch
All My Modifications are at this link: