You can have a dog in a pop-up as long as you are in there with it. You're not to leave the dog alone in a pop-up or tent. You can keep them in a hard sided trailer while you're at the parks, as long as it has A/C. Now we have left our dog alone for an hour or so in our pop-up and we know she does fine, of course with A/C.
We hear dogs barking in hard sided trailers during the day while the owners are gone and we are walking by. So you know a dog will be heard in a pop-up if barking, so I wouldn't go against the rules.
I have heard during busy seasons the kennels fill up and you can call ahead and reserve a spot.
There are pet loops 300, 1500 - 1900, and newly added 800.
I hope even those with hard sided trailers that have a barking dog would kennel them. As a dog owner we would never complain of another dog, however we listened to a dog barking all day long in a motor home next to us in May everyday. Some dogs remain quiet, but others will bark at every sound, put your dog to a test by making it think you leave and see how it behaves. Baby monitors are a good way to test also, or just ask the neighbors to listen while you go for a walk.
Hope this helps, we actually just leave our dog home now with sitters, just more enjoyable to not worry about her.