Those stackable Rubbermaid or similar plastic tubs with clear sides and integral, hinged 2-piece lids seem to be kind of a standard around here. Makes sense to be able to kind of see what’s inside without needing a label on every side. They are very handy, and while they are kind of small for some things, that also keeps you from lifting stuff in one trip that’s really too heavy for your back… You can also color-code them by function: audio, electrical, etc. I tend to put short stingers on winder card type holders, and heavier/longer cables in tubs. I really like stingers that have the translucent plug ends with an integral neon light, you know instantly if a cord or outlet is powered that way, no pocket tester needed.
As to your c-stands issue, Harbor Freight and Ace sell tons of ladder and bike hooks and similar organizing hardware. If it were my van I’d probably use u-shaped hooks and bungies, like a giant horizontal pegboard, or perhaps make a sort of carpeted trough from plywood, anchored to the van floor, that I could drop the stands into, with the end by the doors open for fast access when parked and doors open.