Have seen Reef System moved tanks during exhibitions including aquarama. Saw their similar live stock in their showroom and also in the exhibition so I guess its the same. Also saw them setting up very big tanks and the most live stock lasted the entire exhibition periods. I take that as having the ability to move tanks, water, and probably keep the live stock in good conditon.
Separately, during my freshwater days, I also wanted to move a 4 foot tank. Can't remember which vendor and they also offered the service of moving all the water plus livestock. There should be a few tank makers who offer this services.