Do you have the factory 1,000 watt inverter? Those three or four outlets usually have a blue sticker beside them and will not have power unless the inverter is running off the batteries.
We completely rewired out 2014 Classic, so our electrical is different than standard. One must remember that the 50 amp service is two legs of 120Vac, each with a capacity of 6,000 watts. When connected with an adapter cord to 30 amp service, those two legs are connected at the trailer end and are sharing the one 3,600 watt connection on the pedestal. The 50 amp to 15 amp extension cord adapter does the same thing but one can only draw about 1,500 watts.
WBCCI Life Member 5123, AIR 70341, 4CU, WD9EMC
TV - 2012 Dodge 2500 4x4 Cummins HO, automatic, Centramatics, Kelderman level ride airbag suspension, bed shell
2014 31' Classic model 30 twin beds, 50 amp service, 900 watt solar system, Centramatics, Tuson TPMS, disc brakes, 16" tires & wheels