Not exactly on point but perhaps this will provide you with some ideas.
A friend and I finagled a LEGAL way to collect live rock in the Florida Keys, Marathon to be precise - back in the 1990's. Basically we signed on as crew with a licensed collector. We did this as I was building up a 150 and my friend a 1,000g tank to go in his new addition. We needed a lot of rock.
We collected it and staged it in an undisclosed location. ;-) The day we were to start the drive back to Cambridge, MA we woke early, rented a big A** GMC Allison diesel truck - 24' box - then drove to Home Depot. BTW - It was summer and a refrigerator truck was too expensive for us to rent. At HD we purchased many styrofoam 4 x 8 panels. I think they were 1" thick. We had brought a few powerful air pumps, air stones and plenty of tubing, 3/16" I think, with us, plus a number of clamps so that we could balance out the air flow.
The floor and sidewalls of the truck got double layers of styrofoam, we put our fresh liverock in giant barrels we picked up at a local food distributor. Pickles had been shipped in them. No matter how much we washed with water and rinsed they still smelled like pickles, which, since we had no other barrels, we were also in. (OY!! That's terrible. HAH) But we plowed forward. 12 barrels were filled with rock and natural sea water nearly to the top and went into the truck in the shape of an Iron Cross. 4 more barrels filled to the brim with ice went in the corners.
Then we installed the airstones and cranked the pumps (driven by some sort of converter off the truck's power supply - my friend was frickin brilliant at this stuff,) put on the barrel covers, and capped them all with more double layer sheets of styrofoam. So we had live rock in a giant cooler in a truck.
Day one: We managed to do all that and hit the road at 2:00 pm. Got to a motel in GA at 2:00 am and managed to convince the night clerk to let us power the pumps with an extension cord out our window. Day 2 -- driving by 9:00 am and arrived Cambridge about 20 hours later. Unloaded the rock next day. All but 2 barrels made it perfectly, the other two were FOUL! The temperature which had been 80ish when packed had been brought down by the ice to 70. We were very surprised.
First night I had my rock in my 150 I went downstairs and shined a flashlight and the number of small copepods and such in the tank was astonishing. Caught the mantis shrimp who hitch hiked. Let the gorgeous nudibranch live out its natural lifespan. Kept this tank pretty much as a FOWLR.
My 150 ran for about 8 years before I sold it to a dentist - hope it is still running now. My friend still has his 1,000 up.