As you can't move a full tank, and can not remove the GSP that's attached to the glass. I offer for your consideration. Purchasing a plastic container, large enough to place your 20 gallon tank into. The tank wont have to fully fit. It would only have to be big enough for the back glass, GSP side, to lay down in. Then fill with water (same water you just removed from the tank) to a reasonable level. When you get where you are going then right the tank. Wipe down the outsides of the glass, Place on stand, And refill. GSP should be fine as it only was out of water a very short time while you placed the tank into the container and when you remove it.