I have frozen completely decorated cakes with no ill effects, whatsoever. I personally would make about 6 -10 or so every few days, when I felt like it, lol. Bake, fill, ice, cover with fondant, put them in a box, and wrap the box with saran wrap, several times, and freeze. Choose boxes that they fit in without too much extra space, so you can get more in your freezer(s) without too much wasted space. Make all decorations in advance, 10-20 at a time, assembly line style, If the wedding is Saturday, take the boxes out of the freezer on Thursday night, LEAVE THE CAKES IN THE WRAPPED BOX, and let thaw overnight. Take them out and decorate on Friday.
Plastic skids (like the bread guy uses) are really great for transporting them, since you can stack them, and they lock together! You may be able to borrow some from somewhere, if you put down a deposit.