I should add to my coments above
I said I have never seen either a 100 amnp (twin 50) Site or coach
I have read of them.. Just never seen one.. Reason follows
Very few of either exist so if you have a 100 amp (Two 50 amp cords) coach you are going to be paying for two sites at most CG's
And if you wired your CG for two 50 amp feeds at many sites.. You spent a lot of money for nothing
Now some folks might be tempted to "Cheat" and use the 50, 30 and 20 amp outlets.
The park I'm in now has a burned out power feed to some sites. seems the wires were overloaded.