Agree with you and feel the same about RV Parks or Campgrounds requiring you to leash a dog, but no mention of cats.
We have not experienced, a cat roaming around our site..YET, but just recently, Kevin and I were discussing how when checking in they (campground host) will ask you if you have a dog, no mention of cat. Then the "rules of the park" will state that "dogs must be on a leash at all times" again no mention of cats.
We are not cat haters...only feel that when out in campgrounds, leash laws should apply to all. Dogs Poop...Cats poop. My dogs will scratch and kick as if to cover their poop too
...would that make a differnce!?
What can be done....I don't know. Maybe by us writing letters to our favorite campgrounds, or just focus on State Parks.