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We have turned a truck bed into a cooler on a couple occasions with elk quarters in 70 deg weather. Block ice and a couple tarps is all it took.
I used to hunt the snake quite a lot. As long as you get the skin off, and better yet quartered so you get the heat out of the large joints, and out of direct sun you should be fine. We hunted there for 10 or 12 years and a couple of us a year (and sometimes more) always got deer. It gets cool at night, usually, so that's helpful.If you were going to be there longer than over the weekend, I would definitely do something about it.