No I was not.. HOWEVER.. I came close once.
My normal schedule from about Nov-1 to after Easter (April 1 this year) is to spend 2 weeks in my membership park (For which I pay abut 50/month) and then or my Week out I go to one of two government parks (there are 3 I can use) one is a County park, one COE (Federal) the 3rd is a state park)
I was told at the COE park that if a shut down happened we would have to clear out and if it happened before I pulled in my reservation (pre paid) would be refunded. I forget if the shutdown ENDED before I showed up (Think that was it) or did not happen. but that was the word.
Many were evicted.