Get a Great Dane, tan and white, and put a saddle on him. Claim he is your daughters pony. He would get used to the bit, if you tarted training him a month or two early...maybe.possibly...could happen.
Silliness aside Good Dog Owners are suffering for the sins of those who are too lazy to school their pets and pick up after them..and even bring unsociable dogs intp RV Parks.
WE never brought our now deceased friend and family defender with us, but have RVing Friends that did/do.
Not a lot you can do about State Park rules, if you live out of state and don't really have a voice in stat politics or DNR or whoever operates the State Parks. You just have to pay or go to another Park it seems.