I'd ship it overnight air to a friend who will put it in a freezer. It may cost you a bunch but it's better than spoiled meat especially if the hunt cost you a pretty penny to start with.
I have a 3 hour drive from my hunting land to my home and I used a body bag last season. They can be tough to find but one of the guys in my reserve unit is a EMT (paramedic) and got 2 for me. I put a whole deer in one bag then put that bag and a few bags of ice in the second bag. The nice thing about them is no leaks. The average kitchen garbage bag is about .6 mil while these things are about 8 to 10 mil. They also have handles and a zipper to seal it up. As tough as they are they can't be dragged. Strong as they are they will still rip. I'm also fearing the day I get pulled over by a cop and get caught with a full body bag. I might have trouble explaining that one.