I also make my own trail mix and it has a ton of calories and taste. Here is the mix:
1 part peanuts, raisins
0.5 part craisins, m&ms, chocolate chips, almonds
If my memory serves me, a pound of it (3 cups maybe) has at least 2800 calories. It isn't the best in the heat w/ all the chocolate, but the morning after it has melted it becomes nugget clusters.