Lots of weird info being posted here! A modern pedestal is wired with two 120v conductors, 1 neutral conductor and 1 ground conductor. The campground source is feeding each pedestal from another distribution panel and you are not sharing your individual circuit with another pedestal. The pedestal manufacturer has pre-wired breakers for the 50 amp, 30 amp and 20 amp outlets to the 50 amp source connection. So if you use a 50 amp to 30 amp adapter, yes you will be accessing one leg of the 50 amp outlet and usage will be limited to less than 50 amps only by the breakers in the RV.