What size is the aquarium? I could never give up a tank like that. These are the possible steps I would take if I were you.
Materials:
-Tupperware w/ locking lids
-Buckets w/ locking lids
-A few boxes with possible insulation
Take the tupperware and fill it with some of the water from your system.With these you can take corals and put them in the tupperware dishes. I would even go to wrap the tupperware with newspaper to help insulate them a bit. Anything that is too big to fit in the tupperware can go into the buckets(such as large pieces of live rock). Make sure to fill the buckets up with enough water to submerse the live rock and larger corals. The 4 hour trip in a heated car should not be an issue.
Take the koralia's, put them in a ziploc bag. Take the light, wrap the wiring around it and put it in a box to help protect it.
Once the tank is empty of live rock and corals. Bring the water level to just above the sand line. The tank should be good to go. Hopefully you can fit it in the car where it is heated to keep the water warm and prevent die off in the sand.
Hopefully you have salt and water ready at your future living situation (house, apartment, studio...etc. etc.). Or at least bring all the salt you need with you. If you have a stand for your aquarium that should work out and you can simply transport that as well. If not, make sure you have a place to set your aquarium.
When you get to your place. Fill up the aquarium half way with freshly made saltwater with the correct temperature and salinity that you have your tank at now. Obviously this will help with the stress on the corals and your mind. Place live rock in along with corals on how ever you would like. Once that is all in, pour the remaining water from the buckets and tupperware into the aquarium to fill it up(if you don't have enough that's ok just make more saltwater). Put the koralia's back in. Make sure everything is in place and set to go. Put the light back on top and plug things in.
Hopefully everything works out as planned. Take your time and I would set at least 1-2hrs break down time and 1-2hrs setup time to make sure you get everything right.
I think that is it in a nutshell. If you have anymore questions fell free to ask. Hope all works out well.:bounce2: