Peter,
I have some of those same fixtures that I regularly use on a small band gig. I mounted them on a square crossbar that I got with some ST132 stands. The bar was long, so I cut down the ends with a hacksaw. All four fixtures now live on this stumpy 40" bar, prewired and ready to go. I also plugged Wi-Cicles into them so I don't need to run the DMX lines. A single powercon cable feeds each tree.
Best yet, all of this fits into a Audiopile C001 trunk. I built three compartments in the bottom of it for power, NL4, and DMX cable and controller; on top is a removable shelf that the lights sit on. So, this trunk is the first thing unpacked at a gig, and the last thing packed. We set up lights first, get power in place, place loudspeakers and cable them. Then trunk two opens.
A second similar trunk (an RT01) has tubes for the mic stands (horizontally), with a similar shelf on top. That holds a lift out tray for mics/DIs, and all the XLR. These trunks are the same size. Basically this trunk has everything from the performer to the snake/console.
This goes along with a mixer rack with wireless mics, IEMs, and a couple of four channel amps. Those three cases, some subs, mains, and light stands do the whole gig.
Anyway, maybe more info than you needed. The whole thing started with me having the same question as you, so I thought I would share.
Other than that, I also had a custom box built with two prewired bars that have four RokBoxes each (that is the bigger version of the Hotbox). The case ended up being big, not easily fitting truck pack dimensions... but it works well and holds some power, DMX and a small controller too. Good for when someone need a couple of powerful lighting trees.
Hope that helps,
Nils