Yes, it is. I've been there and you can bring your own tube. you're paying for the ride to the launch off spot and parking. There is public access at the launch off so you can use your own tube and pay nothing but how do you get back to your car or get to the launch off unless you have two cars in your party.
I'm not completely sure, I would want to say yeah it should be fine as long as someone is getting a tube from them
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