@Maria13879 I've seen many listings for stationary trailers that are on the host's privately owned land - say, on a ranch or even just a large backyard. Depending on the local zoning laws, you might be able to find a vacant parcel that would be suitable for this. But inside a regular RV park, commercial usage is usually prohibited, and I'd be surprised if you found an exception.
FYI there are other peer to peer platforms that actually allow you to rent out RVs and trailers for mobile purposes, which is not an option on Airbnb. I have no idea how safe or profitable this is, but it's an option.