I have stuff separated by function, and only take what I need when I need it.
A parts bag always in the jeep, under the rear seat next to the jack, with spare sensors, tape, crimp connects, etc
A tool bag with a full set of hand tools that I can throw in the back or take out
A bug-out bag with water purifier, blanket, beach towel, waterproof matches, etc, for camping or any driving in potential bad weather
A recovery bag with straps, hooks, etc, for wheeling and bad weather
An expedition bag with spare shafts, spare hubs, etc., for camping or hard wheeling
I want to get a roof rack for the expedition bag, and have looked at making a reinforced drum carrier for the recovery parts to mount in the spare tire, but the rest of it just goes in the cargo area as I need it