I found one of these types that fit in my TJs. I holds a ton of ****! We beat on our Jeeps and there is some tricks to learn on keeping tools and such from rattling. Old towels and pack it tight helps.
I built a box out of 1" plywood. Brackets on the inside. 4 holes in the bottom with j hooks that secured the whole thing to the floor. Back end of the top follows the outline of the inside of the tail gate. Back end of the bottom stops before it gets to the tire changing stuff. Painted it but mine is never outside in the rain with the top down. I put 4 large eyehooks on the outside top corners so I could strap more stuff down if necessary. 2 door Jeep so no back seat of course.
My suggestion would be to paint the Jeep pink! I doubt that most pink jeeps would carry any kind of tools. Just a simple game of deception. A set of headlight 'eyelashes' would complete the illusion!
metal military ammo boxs,,,bolt them down and fit with padlocks holding the lid down..long tools put under hood.plastic and fiberglass boxs,are tough, but the thieves will try to get in them ,because plastic is quieter than metal when you smash it with a sledgehammer.
You know, we didn't understand the 'Jeep thing' until we added a Gladiator to our fleet of R&D vehicles. Now, we get it and we can't get enough. The JT was a blast whether it was a trip to the store or a weekend in the woods. We're excited by how many Jeep customers are loving our gear and can't...