I think there is a bit of confusion with my trucks. The crewcab Defender is very well organized, everything lashed down, in cases, crates, boxes, what-have-you. When I go out in my Range Rover, I am constantly mixing up the type of gear I take, weather it's an overnight trip, a weekender, or a week long trip. I'll always take a few of the same boxes of food, cooking gear, emergency gear, sleeping gear, etc...
But, what I mean when I'm constantly changing, is one trip I'll take out the 12x20 camera in a box that measures 24x18x14, my camera backpack, a medium format case, several different tripoids, a map case, a pelican case full of my Great Salt Lake library...you get the point I think. So, I never have one 'set' way of packing, because I never have one 'set' of gear.
Not that it really matters, but I think that what I am talking about and what other people are thinking about are two different things.
My vehicles fortunately don't have to have a very rigorous set of 'being' when I go out. I know where everything is, but since I don't live in the truck like TeriAnn does, I (for better or worse...) am allowed to have a more of a 'Tetris-like' system of packing.
I am envious of the zen-like packing abilities of many who are on here.