Utility Package Owners: What have you done with that extra space in the back?

Pretty self explanatory. People who opted for the Access Cab with the utility package- since there's no seats to take up space back there, have you worked out any alternate storage setup?

I'm considering what I should be putting back there and how to stow it so that it won't rattle or slide around. Obvious stuff like winching tie downs, first aid, jumper cables, and so on go in the cubbies. But if I want to stow some more stuff back there like a small fire extinguisher, a whole jumper pack, or even an emergency attitude adjustment device (ballistic or otherwise) that won't fit in the cubbies, I'd rather not have it just flopping around back there.

Are there fabricators out there that make custom cargo solutions for utility access cabs?