I think back about what I used to carry in my kit. Some things not mentioned yet:
Cheap plastic rain poncho
In colder months a mil field jacket liner. They compress and roll up into a small bundle in case you get caught out in the cold for longer then you expected for the coat you chose for the day.
If you carry a pistol daily, throw in a couple extra mags.
You said you have tools on your truck, but if you don't have one onboard, I like to have a 5 or 6 inch light fixed length knife.
Bag of beef jerky
Cheap plastic rain poncho
In colder months a mil field jacket liner. They compress and roll up into a small bundle in case you get caught out in the cold for longer then you expected for the coat you chose for the day.
If you carry a pistol daily, throw in a couple extra mags.
You said you have tools on your truck, but if you don't have one onboard, I like to have a 5 or 6 inch light fixed length knife.
Bag of beef jerky