We just bought an rv park from a lady that had a similar situation. she built an rv park with her husband and came to found out it was a little too much work. because they didn't have much income coming in they did not have much financial room to work with. We found the park advertised on
rvparksale.com I know for a fact it did not cost her a cent to advertise it. Apparently they do it for free. Try that and hopefully you will get some hits or maybe an interested party. Good luck