I had similar thoughts about trying to keep deer in hot weather. sounds kind of bulky what you want to do with a generater. I had thought one time about building a box that is foam lined. then i would put the der in the box and pack with ice. I have frozen 2 liter bottles before and stuffed them into the cavity to try and lower the temp quicker. by putting frozen water in containers it doesn't get the meat all wet as it mellts