well im going to assume that since its a 55 gallon, the fish arent that big. what you can do is buy a couple of food safe rubbermaid bins, the ones that you use to store all your excess stuff. target and home depot would have them. make sure you get the ones with the snap on lids. buy a battery operated air pump and connect them the tanks, just stick them in through the top. the fish will be in the dark so it will help a bit they are known to be less restless when in the dark. just move them that way. it works my friends did it and they went from va to cali or something. its safe because the lid snaps down so you dont have to worry about the fish escaping and youre giving them oxygen so they should be ok. if you want get to your lfs and try to get hold of polyaqua its a fish protector and its used to ease the fish in transport it also helps to build their slime coat and better their immune system its like a fish sedator. you can use it and they will be much calmer during the move.
as far as the tank goes try to empty the water out down to right above the gravel line. this way you can keep the beneficial bacteria alive so that hopefully the tank doesnt re- cycle once it gets to its desired destination. if you have any more questions pm me.