I agree with Threebutchers. Check for one or more outlets that is a GFI. It will have a test button and reset button. My 5'er has one located on the side of the kitchen sink cabinet. Other outlets go through this one GFI.
2006 GMC 2500HD CCSB 4x4 Duramax/Allison, Titan 52 gallon fuel tank, Prodigy Controller, B&W Companion Hitch
2010 Jayco Designer 35RLTS, Cummins/Onan RV QG 5500 EVAP, Progressive Industries EMS-PT50C, TST Systems 507 TPMS, RV Flex Armor Roof