My experiences this past year suggest that this is an area that really, really needs to be addressed- by code panels, code enforcement, and park managers.
Power runs that usually have no problem supplying a dozen spaces are tripping out with just one or two "RV's" plugged in. Some of these monsters have, besides air conditioning, every appliance known to man - including hot tubs.
Internet sites are awash in clever ways to either bypass the OCPD, or to draw power from multiple circuits - or even to cobble a generator onto the PoCo feed. Codes? Safety? What do you want - it works, don't it?
Nor are park operators innocent. I just left a fur-ball where the park owner has been sneaking mobile homes into RV spaces.
As best I can tell, your typical park has an over-stressed service the day it opens.