[Jfish]

I take it your getting just enough water to transport the live rock. So what I would do is go get a large rubbermaid bin. They are cheap and will probably hold most of your rock. When you get home throw the rock and used water in there with a heater and a powerhead. That should keep the rock in fairly good condition until your tank is ready for it. Then i'd get the tank to the spot where you want it and make sure its level. If its level or reasonably close your good to go. I would then put in some eggcrate and then put in the desired amount of washed sand. The eggcrate just helps keep sharp rock points off your bottom glass. I would then fill the tank half way with RO water or whatever your using and once its about half full slowly mix in small amounts of salt until you get it to the right level. Ideally you should let it stir and mix up good for a couple days before adding live rock. Once you do end up transfering over the live rock it should be close to full and your on your way.