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

Wiz,

From the OP. Does not imply to me that the single 120V hot wire is protected by a 50A CB. That wire might have more current carrying capability as part of the distribution system.

"How common are parks with "cheater" 50amp service? By "cheater" 50amp service I mean a standard NMEA 14-50R outlet that has been wired with BOTH hot terminals on the same 120v leg. "Cheater" 50amp service does not provide 240v - only two 120v circuits."