We are x-full timers that now travel quite a bit. There are some very valid points being brought up here. And as former FTers I must admit the monthly long term rentals have ruined many parks. Parks that used to be beautiful places to visit have turned into dilapidated trailer parks with rotting trailers parked next to $500,000 diesel pushers.
When we travel we refuse to stay at any park that has sheds, portable carport tents, or piles of junk at campsites. By voting with our money we support quality parks that cater to true vacationers. Plenty of people we speak to in our travels are starting to do the same.
Also, I would like to mention in our state (Florida), the state parks only allow about half of the sites to be reserved. The rest are “walk up sites”. This allows you to still get spontaneous and take short trips without notice. If you arrive Monday through Thursday you are pretty much going to get a site at almost 100% of our state parks. I believe many other states do the same. We just call the office before we leave the house to confirm they have plenty of walk ups available. We have stayed at Gamble Rodgers, Bahia Honda, and many other “unobtainable” parks just like this.