I keep Contico boxes packed with what’s needed. I think they’re brilliant. Weather proof and they can be locked. 
Discussion
What is your truck EDC list? I'm interested!
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The basics are dry foods, water and water filter, sleeping systems, cooking system, all weather clothing, basic tools and med, usb lights, battery bank, solar recharge system, important books, and a french press. My bag has all my personal items and protection.