Thank you WickedNag and Painted Horse. I hadn't thought of hobbles. I've just seen the high line, when I checked out the camp site I want to stay in. As far as the tail thing, he's a pretty level headed guy. I've been working on getting him used to harness, as I want to drive. So he's used to all manner of stuff under his tail. And the crupper, too. I'm looking into getting portable fence. It seems kinda spendy, since I haven't even camped yet. Thanks again for the good advice.
Looking at the trail through the ears of my horse...wonderful!