How common are parks with "cheater" 50amp service?

allen8106 wrote:

TDIStan wrote:
I mean a standard NMEA 14-50R outlet that has been wired with BOTH hot terminals on the same 120v leg.

This is standard for RV's and RV service. This gives you two 120 volt legs in your RV. One usually runs the AC or multiple AC's, the other usually runs all other 120 circuits.