Personally I would (and Did) install a dedicated 30 amp outlet. I was running my AC while we were packing getting ready to leave for a trip. It was 90 degrees and about 90% humidity. I plugged the RV's 30 amp cord into a 20 amp socket in the garage with one of those adapters. After about a half and hour the A/C quit....I thought great just as we are ready to leave. When I went and checked the outlet the amp draw had literally melted the inside of the receptacle to the point it shorted out and actually had a burn mark like a lightning bolt on the sheetrock. So it must have shot out a pretty good arc. Lesson learned, I installed a dedicated circuit and 30 amp receptacle.Thank goodness for circuit breakers.