$150 in materials.
I have a contactor's canopy on my pick-up with tool boxes in the sides of the canopy and barn door 49" wide. My slide fits just under the tool boxes, and I get about 46' width.
2.5 gallon gas cans fit on the side, two behind each wheel well.
I can fit my modded hand truck, Arbor trolley, and either small pancake air compressor or blower on the tray with all my rigging gear. 3 top handles in the side, long handled tools and saws in the bottom, along with some tie-down chain, binders, chocks, hitch slugs, etc. Cones and rakes go on top of everything, first out, last in.
All my climbing gear goes in the one side, and gassy, greasy, sharp stuff, chaps, chain/ parts box, spray paint, lubes/etc, go on the other side.
Pics to come.