What kind of extension cord should I use for an RV hookup?

Get a 30-amp (TT-30P) or 50-amp (14-50P) RV cord, not a household extension cord. Household cords can melt, catch fire, or trip breakers under sustained high loads. Use a 10-gauge minimum for 30-amp and 6-gauge for 50-amp. Match the cord to your RV’s inlet, not the pedestal, and use an adapter if needed.