Storage of equipment in work vehicles has been an almost constant irritation of mine since I started working for myself 13 years ago.
Over the years I've worked out of old beater trucks (large and small), an SUV, a cargo trailer, new trucks (large and small), an old van, and even commuted out to one job in the country on my scooter one summer.
I've noticed that with my (and many colleagues) extended cab work trucks, the back seat area is usually full of equipment. Some tools and materials need to be protected from the rain, snow or thieves. It almost always ends up a mess, unstable and impractical, because the floor is uneven. Well one day a couple of months back I had enough and pulled into the hardware store and built myself a simple set up that has worked much better...