I had a shoe pulled off when it hooked a tree we were going over. I lost another one that was sucked off in deep mud. It happens.You're definitely not over thinking it. I've had them rub off a halter, break lead ropes, chew thru lead ropes, pull a 3 foot sapling out of the ground when foot staked and many other reasons. There is no guaranteed way to keep them in camp. While tying is the most secure anything can happen. I always keep one tied (I like to hunt horses less in my old age). I've come to rely on foot staking with a chain and a swivel snap on both ends. It lays on the ground better doesn't wrap around their back feet, doesn't go up in the air when they lift their head up. I've used it on over 30 head of stock and never sored or injured one yet. Elk are hard on your electric fence and cows with calves are the worst however it's entertaining to come back to camp and see a big 6X6 laying down in the fence with your horses a 100 yards from camp. Feed and water are the major concern. If it's not there you have to haul it. Horses out on the range generally water once a day. You'll have to figure out based on your terrain, heat, usage and forage how much to water. Now this is going to curl the hair on some pet owners but 36 hours without water on a horse that is not used, is not the end of the world. My horses in the winter sometimes water every other day. If you've never seen a horse stick his head in a trough up to his eyeballs to drink he's not that thirsty. Remember you can colic a horse on cold water. Colic is a stomach ache in easy to understand language. I learned as a kid to give a horse an IV shot. Take some colic meds with you and know how to administer them either IM or IV. I can't count the number of people I've helped over the years with a young out of shape horse in the mountains. I take some lidocaine to suture also. If I'm setting up a long term camp some penicillin and dexamethasone for swelling. Since I shoe my own horses and hunt in the rocks all the time I make an extra front and rear shoe and keep a hammer and nails in my cantel bag. Have your farrier make some extra shoes and learn at least how to nail them on. On a side note don't cuss your farrier if your shoe comes off. I've seen them not survive the first trailer if you put six or eight in a stock trailer. Talk to him before you cuss him to your neighbor. I've replaced and tightened a lot of other people's horse shoes on the trail. Maybe that why I had 22 pack horses to get camp in with all that crap.
I have seen people who think they know how to give IM screw up and give IV and the opposite of that.
Great advice! I know my farriers have all been really great and have worked with me and so has my vets.