I've got 4 or 5 sets of 4' high panels. They make a nice large yard with room for picnic table, chairs, grassy space. We use white plastic coroplast for the gap under the trailer - very light. The dogs aren't allowed to jump on the fence, but we still stabilize it with "pigtail" electric fence posts.
The panels are heavy... we have a carrier at the back of the camper for them to travel on, but not because they are pee'd on - we don't allow any pee or pooping inside the fence - it is our living room! It didn't take long for the dogs to learn.
I love not having to have the dogs leashed! I'll take a few photos once the gale force winds and rain subsides and post them on my blog.