I purchased several of the Coleman Extreme… I think they were 50 qt coolers when they first came out. 12… 15 years ago? More than 10 anyway. $50 at the time was A LOT for any cooler except Yeti. Regular 48 qt Coleman were going for $20, or less on sale. I always thought Yeti were too large, heavy and cumbersome for my uses.
Used them for extended beach camping in North Carolina in a highly modified Jeep XJ. I ran 3 Coleman coolers in it and they would hold out for a solid week - 7 days. There was still ice in cooler #1, and #2 was cold enough to grab drinks out of.
Cooler #1 pre-cooled and filled with blocks of ice. I would masking tape the seal and put it under a blanket covered with a white tarp. It got opened once every ~2 days to restock Cooler #2. This was strictly just ice storage.
Cooler #2 was pre-cooled and opened once a day. It was the main food stock storage. I would pull out enough for the day then reseal and put back under the white tarp. Restocked with a block from #1 as needed.
Cooler 3# was the daily use cooler. I would try to limit opening, but whenever I needed something I did not hesitate to just open grab and close. Restocked with a block from #2 or #1 as needed. I usually grabbed what was left in #2 as the fresh block from #1 fit nicely in #2 and #3 really did not care what size the block was. I would also use ice from this in the small 6-pack sized bait cooler. Didn’t use much, just enough to keep bait cool, not ice cold.
By pre-cooling I mean I put ice in them and gave them 24 hours to cool before stocking them for a trip. Also anything put in the coolers was as cold as I could get it before putting it in. This cooler system did many summer trips to Core Banks in NC. The ferry drops ya off, waves and says they will pick you back up on next Thursday at 4 pm (or whatever day/time). The only things out there are other fishermen in their camping vehicles, fish and one water well and pump at the ranger station, by the ferry dock. If you did not bring it, you do without it.
The Jeep was parked for camping just above the high tide mark, right on the beach. I would move around to find fishing, but it was always in the direct sun. Dark green Jeep too.
With the windows open and taking advantage of the shore breezes, you could keep it fairly cool in the Jeep but not cooler than summertime NC beach temps. Water management in the coolers was also always a consideration. You had to be careful about draining that nice, cold water away. Putting it in a jug in Cooler #3 helped keep ice costs down. I was extremely pleased with the coolers.