Taz,

I hang my deer with a gambrel, by the hind legs. In warmer weather I take bags of ice, stack them in the body cavity, then wrap the carcass in a tarp to make a " chimney" . Cools them down fast, and keeps them that way.

A word of caution though---put a large bucket under the deer' s nose. When the ice melts is will drain and can make a heck of a mess.