Many 30 amp receptacles are wired with 10 gauge which meets most codes. If the receptacle is quite a distance from the main and transformer you will always see voltage drop that approaches the need to manage loads.
One of the huge benefits of a properly wired 50 amp receptacle and of course 50 amp RV
I encourage anyone adding a receptacle for and RV to always go 50 amp even if they currently have a 30 amp RV
Back in the day I have burnt up more than my share of 30 amp plugs in the summer time trying to stay cool and get a few other things done
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