Dry Ice Anyone Use It?

My brother in law and I have been wanting to try using Dry Ice on our camping trips. Where we go it can get well over a hundred degrees and Ice does not last long at all in any cooler. Has anyone used it before and what is your experience with it. Good or Bad.

We have a huge white Costco Cooler that we were going to put a small amount in just one corner wrapped in cardboard so it doesn't crack the plastic cooler bottom and then put a thin layer of regular ice on the bottom of the cooler. Our food on top of the layer and then of coarse a thinner layer of ice over the top of our food.

Is there a better way? We cover our cooler with towels at the campsite and place under any shade we can find so the direct sun doesn't beet down on it . Suggestion and stories please.