I could certainly understand why they didn't wouldn't want you in there. What I don't understand is why they are not refunding your money.
When I had a motor home, I would call RV parks ahead of time to make reservations. They almost always asked the age of the RV. Back then, most parks didn't want anyone older than about 20 years or so.
When it came to marina reservations, I cant think of any marina that didn't ask the size, draft and type of boat. etc.
Anyway, I'm glad you found a place to stay and I am sure you will eventually get your money back.