As my camping is, generally, solo, unless I take my van (which has a 2-way Norelco fridge), I think a cooler works best for my travels (but 1-2 nights is as much as I do in my Lexus Land Cruiser). I picked up the RTIC 25 for $101 on their current sale and it will more than suit my needs vs. the old Igloo I had. Frozen Costco water bottles for ice. Mostly, I wanted to bring things like eggs, cheese, butter, bacon, deli meat and similar vs. just non-fridge foods. Not concerned too much about beer when I can have a nice Cabernet or scotch.
However, if I were a base camper, in one location in a remote area for a few days, I'd have a fridge, second battery, and solar. I looked at a fridge and the Goal Zero Yeti 1000 ($1000 at Costco) and a fridge for $500-600 but it simply made no sense for my shorter trips in the LLC when a small roto cooler using frozen water bottles ran about $100 shipped.