I'm sure I'm not the first, but I done it. I got tired of having to shut down everything in the trailer when the GF has to run her leafblower strength hairdryer, lest we blow the main, so I have now installed her a dedicated blow dryer circuit.
I installed a 125V 15A Motor Base on the exterior of the trailer that comes in under the vanity and a 125V 15A GFCI in the side of the vanity and wired it with Romax. Along with that, I threw an extra 25ft 125V 20A extension cord into the storage box on that side to connect into axillary outlets in the park power box. Now she has her own dedicated blow dryer circuit and we don't have to shut down the A/C, Water Heater, Fridge, Lights, TV, etc, etc, etc....
I originally suggested just leaving the blowdryer at home... but that sure didn't fly. Who knows it could come in handy for an extra heater if it's really cold.
Total cost: $41, happy GF: PRICELESS!