Well, I'm glad I sorted this out when I did.
Had a minor mechanical issue at the Desert Rendezvous this weekend. Among the tools I needed to use to (finish) removing the dragging rear shock, then replace it back in town, was my 19mm deep socket.
I ended up using the Home Depot document bag and cut-down socket rails - mostly down to cost - $3 for the bag, and I had unused rails sitting in my tool drawer. Not a great picture, but you can see it on the right of the tarp here. Having the right tools is key, but making them easy to store and find in the vehicle means they're more likely to be at hand when needed.
After replacing the factory scissor jack with a bottle jack, the stock jack compartment holds all the above tools, (plus a few not shown), plus the OEM jack wrench which I still use to lower the spare tire.
Thanks again, everyone!