Another thing I might add- always have a backup plan.
I travel alone with two horses. I know how to change tires, oil, batteries, and other small things. But when my alternator went out halfway through a 12 hour trip, I was in trouble. Took quite a bit of work and research on the side of the road and a repair shop to figure out what to do with my horses for the night and following day while my truck was in the shop. Nowdays, I always find 'emergency landing' places, where if something were to go wrong, I could stay. Some are boarding barns, or private homes of people I know. I keep all the phone numbers on me.
I also have a 'cheat sheet' of emergency contacts, veterinarians, farriers, where I'm from and where I'm going, and some other health information for both me, the horses, and my dog, just in case of a wreck and I can't answer. I've been very blessed and haven't needed it yet, but I feel better knowing its there.