it sounds like the OP is simply adding an additional A/C unit to his/her RV... which will run off it's own 'shore power' cord directly to another outlet, instead of being wired into his/her own Main Panel within the RV...
if that be so, then no GFCI or otherwise separate 'breaker' is needed, as the outlet's circuit breaker will be what protects the wiring, just like when you plug your Shore Cord into the campground's outlet. The circuit breaker that's already there takes care of it.
I do this with my son's camper since we installed a separate 'Hot Rod' electric water heater element into his 'propane' only original water heater. I simply plug the Hot Rod's 'extension cord' into the 15/20amp outlet at the campground's power pedestal. No need for any additional GFCI protection, or separate breaker - it's already there.
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the Turners...
two Campers, two Electric cars
former diesel pusher traveler
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