something to keep in mind using a corral system .........most if not all parks and campgrounds require a physical tether and someone with the animal...(being inside , does not count)

an animal contained in a pen is nice but not considered on a leash and could and has resulted in being ejected from a park.........our opinion on the issue does not count , most parks in black and white when you register have this written in their rules...

I am also a dog owner..(hate that word)..I understand your position and the parks.....unfortunately some have spoiled it for all, and animals just like us have their own protection methods and territories and will stand ground when they feel violated the only way they can no matter what we think........Children love dogs and will walk right up thinking its ok to love them and pet them , adults also.......no matter what type of animal it is or how well it is trained it will react if startled or feels threatened ......All animals do this including us...the parks liability becomes an issue when it occurs 


answer to your original question..

metal panel systems used for shows are excellent choices and can be added to to make larger areas and are collapsible for travel and storage......some also come with gates and port holes to accept kennel systems