Someone asked me about this in another post a while ago, and I just got around to taking some photos of it.
I made this because, hey, DIY is in my blood, I can't help it.
The Docking Station (All Made of PVC + Caster Wheels):
I call it "docking station" because... see the below images for a couple examples of what gets to dock...
Its Sexy Legs:
Who needs sand bags to hold it down when the legs are muscled with pebbles for stability?


The Arms:
The four arms are for easier pulling/pushing the station with a bunch of "No-Slip Grips" on for better grabbing, as well as holding down things like PWIIs or external battery packs, etc.
The Whole View:
This is just one of the many uses of the docking station for lighting. Here's shown my 580EX with another DIY of mine, straw grid snoot...
580EX + DIY Straw Grid Snoot + Impact Swivel + PWII + "No-Slip Grips":