With all due respect except for the old Coleman lantern and stoves which put them on the map, all their other stuff is crap. I have no interest in it.Not taking anything away from the OP but, that example of the coleman extreme is not a cooler. It is a beach chest with wheels. I'm not sure what he expected to get out of it. The lids do not fit well, the lids are not insulated like the rectangular cooler etc. I have zero dog in the hunt as I've borrowed enough of the top dollar models to know where I'm spending my money. Coleman makes it and sells it so, he bought an "extreme" cooler. He just bought a joke of the example
If he had truly picked a 5 day extreme cooler and, it was new, it would have held ice very well. Put a year in the sun on it and forget about it. I mean no disrespect OP when I say that and, appreciate the test.