@Phil-and-Dion0 My rate of acceptance has been as low as 60%, with no noticeable impact on bookings. Nobody here knows all the secrets of the search algorithm, but it does seem to give listings a boost when they've recently accepted a booking or received a positive review, so it's only fitting that the opposite correlative would hold true.
That said, I've also found that the hosts who benefit the most from prominent positions in a generic search are the ones who have generic listings, very much unlike yours. Your target guests are the small niche of people who love staying in RVs or Homestays; these people are digging a little deeper with their searches, using filters, comparison shopping. Being a little harder to find and selective with your guests only makes your offering more valuable and special in their eyes, so I wouldn't waste any time worrying about Airbnb's algorithm.