I NEED HELP WITH SHIPPING RIMS ASAP!?

im selling my rims on the internet. i have a set of wheels with tires still monted on them, what would be the best way? do I put them in 4 different boxes are just put in a big box? im woundering bc thats alot of weight in one box. The fed ex guy is not going to pickup 4 wheels in one box, when I call them to come pick it up.