My antelope rig.
This allows me to wash the blood and any other mess out right away. Then I stuff a bag or two of ice into the chest cavity and put the carcass on a pallet in the back of the truck to allow air all around it. I also cover it up so the sun doesn't beat down on it. It's usually a 2 hour drive or better to the house. Despite all of that, I've still had a bad one or two. I guess sometimes it just happens.
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Stupidity is expensive
If you find yourself in a fair fight, your tactics suck!