Scott,
Remember to siphon off some good water into your containers BEFORE you move any of the rocks around. Once you get the good clean water in the trashcans and containers start putting the corals in the containers. With 70lbs of rock I would split the rock between the 32 gallon trash cans. One of the hardest things to deal with is going to be your clean up crew as they are going to be on the glass, rocks, sand, etc... and it will be some work to get them without crushing them by accident when stacking the rock in the garbage cans. Think of them as $1 bills and it makes collecting them a little easier though!
I like the 32 gallon trash cans cause they are cheap and if you fill them with about 20 gallons of water they are still moveable with 2 guys and don't splash around to much.
When moving the corals you might want to bag some of the larger ones to keep them from stinging each other as opposed to just placing them in a container together.
If you have some extra aquarium heaters they will be needed, hopefully some of the kind with the plastic around them so they are less likely to break. An enclosed vehicle would be good for the corals and fish, like keep them inside a car with the heater going in the car and put the rock in the bed of a pickup with the tank and you should be okay.
My first tank was a 120 that I moved 100 miles in the middle of the summer, and I moved it in the middle of the night to avoid the temperature problems, and it might help you if you planned to do the move at least in the peak temperature of the day. Maybe check the forecast to try to pick a particularly warm day.
Good Luck!
Nathan
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I wish I can make it down sooner I don't even know if I'll have time on sunday 
Please keep the ideas coming. I'm going to start making a detailed plan and hopefully everything goes good.
