I've still got some 'polish' to put on my current setup, before I go through the work of shooting a video. But you can get a pretty good look at some stuff in the thread here:
The drawers are mainly for tools, replacement parts for pressure washing, and consumable items like squeegee rubber, scrubby pads, bronze wool, masks, etc. I also have all my different length squeegees in the upper drawer.
My wfp hose reel is mounted on top of the shelf to the left, and I keep my towels in a basket to the right.
I'm using two large Rubbermaid style tubs in the back seat for brushes, soaps, garden hose, and gutter tools. My little trash can tucks right between the two totes. It's unfortunately more of a reach to deposit stuff than it was in the little toaster... so the car tends to collect junk
I lay may screenwasher over top of the tubs.
I tow a trailer for pressure washing. Pretty basic setup, but it's a money maker.