Instead of trail mix, why not try making pemmican? It is easy to do. I can do it so that says a lot. Basically, pulverized jerky, rendered fat, and some crushed berries. Recipes should be easy to find on the internet.
For a trailmix, small chunks of your favorite dried fruit, some shredded coconut, a handful or two of almonds, hickory nuts, or maybe pistachios, and maybe finish off with a bit of dark chocolate pieces. Raisens could make the mix too.