Too fancy pants for me.
I just use 1/2" steel rods and a single strand of electrical fencing. Hook up my portable fencer if there are other horses around and I'm good to go. Any size, any shape, any terrain except bedrock and pavement. Though I already have a thought in my head how I could do those as well if need be. If it's just my horses and nothing "scarey" around, I don't even bother with the fencer and will tie the fenceline around trees or whatever is available. And if I go camping, I go with a tent, not a truck, so I'm certainly not going to carry around these panels!
Hopefully next summer, we'll be doing that camping thing.
I don't like that these portable fences don't have a gate built in to them. Too much work to take the horse in and out. Maybe the upscale ones do have a gate. Or maybe I didn't watch enough of the video. I stopped after 4 minutes. Nice idea about the drop legs. And nicer than electric for more than one kind or size of animal.