Thanks for the video. Are you storing you valuable tools in the back of the cab?
I found a simple shelves did wonders in the back of my cab (no seats). One low one with things rarely needed beneath, sitting on the floor, like jumper cable, specialty tools, etc. Mostly accessible by pushing the seats forward. On top of that shelf, things like wedges, rope puller, first aid kit, tool box, etc. Out of sight from the outside. Shelf sits several inches below the windows and seatback, Then, on top, the day to day stuff, like lunch, rain gear/ clothes, hardhats/ helmets. When the back if really full, then some stuff comes to the front.
I have a back panel that is hinged on top with slide-out 2x2's to support it. Its good for working on stuff out of the rain/ sun, on the tailgate. Hasps on the box with plastic coated cables run through the bumper with eyes for padlocks to the hasps. Keep an honest man honest security, like running into the store, doing bids out of sight of the truck, etc. Being a wooden box, you can only get so secure, but better then cramming it all in the cab, which is only so secure, having glass windows.
Happy chipping! A good start!