There were kegs from MI last year at San Diego. Those were collected and shipped by Adventures in Homebrewing (shameless plug for my LHBS), and were cold when dropped off and kept in a tight group when in the shop. They were then wrapped with plastic wrap on the shipping pallet. The truck was not refrigerated, and they said it was hot in the trailer when the kegs were loaded. The truck had to drive through the desert Southwest.
My beer was a CAP, and it was the lightest color and lowest ABV, nothing to hide behind. We all said if the CAP made it the rest would be good. It was fine. The comments from high ranking BJCP judges were positive and gratifying. I would say save the money and ship warm.