Here's the
Walmart page on that cooler. They don't stock that one in the store, so it's from a third party seller.
Here's the
Amazon page. Same thing, third party.
I know someone with the Coleman 70 qt Xtreme and they use it on their boat. You don't want a lot of empty space in there, like a bag of ice and a 6 pack of Coke and that's it. But if you fill it full, like 3 or 4 bags of ice and then the rest with food and drinks, you'll go through about 7 pounds of ice a day. If it's outside and 90 degrees and not in the van and kept relatively cool, you'll go through about 10 pounds of ice per day.