Varies from Park to Park.. I have half a dozen parks I frequent.
Where I am now and one of my regular Summer parks Very solid 50 amps, Almost never a problem HOWEVER... Since parking here I have had several power "Flickrs" this is where power is lost for like one second. (This is NOT a park problem but a power company issue)
The surge protector has a timer to keep me shut down for 3 minutes
1 Second is very hard on the A/C.. 3 minutes is a normal re-start
Two of the othrers If not for my auto-former I'd have low voltage issues.