OP, you are in HB and I'm next door in Costa Mesa. Now, i probably use my Ram 2500 Mega Cab truck just a bit different than you but here is what i carry.
I have a sizeable plastic tool chest in my truck i keep in the back under the tonneau cover year round. I keep a lot of supplies in it for our cross country road trips we do several times per year as well as any emergency needs for when we visit Mammoth or the local mountains.
-Complete oil change for 6.4 Hemi
-Brake Cleaner, Carb Cleaner, Trans and Brake fluid to top off.
-Various Hose clamps, valve stems, radator sealant, various size/lengths hoses, and other odds and ends
-8x10 Poly tarp.
-4 55 gallon 10 mil trash bags and several 13 gallon bags.
-Some basic tools that i need to expand.
-10' syphon hose with squeeze bulb.
-Two tow straps
- 50' Length of 1/2" two braid rope and 100' length of 3/8" two braid rope.
-Tire pressure guage up to 150 psi.
-About 10 bungee cords
-6 Ratchet Straps
-36" Estwing Axe
-Several small utility rags and one large beach towel.
-25 Ton Bottle Jack with 2-3 2x6 boards.
-Blanket that is kept inside Mega Cab area with zip lock back of Toilet Paper.
When i am specifically going into the mountains in the winter i will bring a duffel bag of insulated flannels, Carhartt jackets and snow pants. I always carry enough gear to make sure i have a way to either get out of the situatoin im in or be able to survive for a good length of time. I alway have at least one pistol and if a longer trip one of my AR's. I am one of the luck ones to have my CCW in California and carry my Shield 9 or my G19. Installed this for when it can't be on my hip.
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