Mine was behind this same door with hinges on both sides, preventing access into this area. I removed one side of hinges and use it now as a door, easily able to get into this area for access to water filter, water heater, and water lines. Why does Rockwood put double hinges on these doors in production?
2012 23SS ROO
2014 Ford 4x4 F150 XLT 302A, screw, Ecoboost, 3.73, max tow, off road pkg., 36 gal tank, Ruby Red, tailgate step, Linex spray in, Truxedo bed cover, 30% front tint, Viper remote start, 1000 lbs WDH