I evolved into using a 100 gallon watering tank.
http://gototanks.com/100-gallon-poly-oval-stock-tank-arm-10116.html. It has a built in threaded drain. Added a brass hose barb and a length of hose. When transporting have a drain hose exiting the rear of the suburban.
There is a wooden pallet in the bottom too keep meat off bottom of tank. Line pallet with bags of ice. Then add a layer of bagged elk or deer pieces. Then more ice/meat etc. Cover top with old sleeping bag. Add more ice bags to top as needed. Have taken meat across the country and have kept it very cold for over 10 days this way. Perfect storage as I butcher the meat.
