I currently carry a Wave, bit kit, bit extender, and 4" adjustable wrench in a hip pouch. This is supplemented when on duty, with a Leatherman Z-Rex strap cutter with a 1/4" hex drive. In my vehicle I have an el cheapo socket set with a hex drive, 1/4" drive adapter.

This seems like a good beginning, but I am interested in what the assembled expertise of this group could propose for nifty improvements.