CB only has so much range, you need someone kinda close (depending on your setup that could be anywhere from 2 to 10 miles) monitoring the channel. If you plan on future trips getting your tech (or general) license and a decent radio is a good idea, if there is a monitored repeater in range you have a good chance of getting someone.
If you are concerned about not being able to contact anyone what I would recommend is a delorme in-reach, it's expensive but you can also just rent them for when you need it. CB is cheap though, and its good for trail rides, so I would recommend a decent magnet mount antenna and CB radio in addition to whatever else you do.