Which type of site tool box/vault is most secure
I agree with @ Aloysius defenestrate. Video your tools, but next get drill prof locks they do exist or ones that cannot be drilled by normal hss, or titanium nitride coated bits , there are even locks that are resistant to cobalt bits designed to cause the bit to break but any tool vault can be opened, never trust anything that sits on the bed rails of a truck that is aliluminum or even light gauge steel a torch can open most any steel box in a few seconds and aluminum is a joke , not easy to cut through but a rose bud tip on a small torch will turn the aluminum into Jello in 10-15 seconds , I know this as my family business lost several tool boxes full of tools in the 70's in the north bay area of California. Today there are wireless low power systems than can detect intrusion and provide a GPS location using a simple 12v battery and about 1500$ system but that was a few years back maybe much cheaper today. Insurance and documentation of your tools including your initials and last 4 of your ssan engraved on each tool is the best way to identify your tools, after a lifetime of having boxes on work sites unless there is live security your tools can be taken it has happened to my family business growing up and when I was in other states. To tell the truth I found engraving tools and all my tools painted in the same ugly color(think ugly Flouresents) has been my best way in small towns, but insurance or on site security was the only way in larger cities , Several of my friends that have trailers have told me about the mobile GPS systems but they were expensive.