I think you'll be sorry if you don't get a wheeled dolly for it. I actually had 3 44g, 2 with wheels for my 155g tank. The third w/out wheels was for the waste water my wife couldn't stand seeing going down the drain. Kept it for laundry. You'd have to use 2 of them for your new SW mix, whereas I was using one for mix, the second for FW for topping off. When time for PWC's one on wheels was my dirty water siphoned from the tank. Having my SW sitting next to it always helped me make sure I didn't get carried away siphoning and cleaning and take out more than I had ready to put back in.
So, have you thought about how many containers you're going to need? Gotta keep FW available to0, unless you're going straight from the tap. Not good for reef. I'm guessing for that sized tank, you'll evaporate 3-9 or so gallons per day, depending on lighting and ambient dryness or humidity in the room.