What to put behind the seat?

I got my frame tank fixed. So now, out comes the "behind the seat" tank (that thing's worried me for some time now!). Question is: what should I put back there? Build a tool box? Build speaker holders? Some kind of shelving? Leave empty? Then I thought, let's see what the rest of the (Dodge) trucking world has done!
Pics, diagrams, plans, or how tos, would be great!
Thanks

later 90-up trucks have a nice plastic tray that lays behind the seat to hold stuff.

stock speakers hang on brackets in the corners unless you go with truck box speakers.

myself I don't keep anything back behind the seat. I don't keep any heavy/loose stuff in the cab...I rolled a truck one time and a glass 16oz MtDew bottle hit me in the head about 3x,I needed stitches in all 3 places. I seen it hit me 2x for sure.

good thing my 12x16 metal tool box was in the back of bed at that time. I had been riding it in the pass side floor earlier that day.

so strap/screw/bolt it down in the cab to be safe.

i have a rack bolted to the back wall, that holds a feral hog elimination device, model M4. under that is a tray, and a box on the pass side holds the jack, and tools. back wall is carpeted, over soundproofing and insulation. i'm in eye-owe-uh, so too far for pics.

Quote:

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I rolled a truck one time and a glass 16oz MtDew bottle hit me in the head about 3x,I needed stitches in all 3 places. I seen it hit me 2x for sure.

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hey scratch, they're all made from plastic now. roll-away!!!!