Looks like my response to this was lost during the blip in the Matrix.
I bought an ICECO JP40 12 V fridge right after the first of the year, and have been running it pretty much non stop in my truck till two weeks ago when I took the truck apart for some major work.
So far, I really like it. It does a great job keeping cool water in my truck at all times, even in FL heat. I have, twice, run it to the point the low voltage cutout turned the fridge off, and that takes about 40 hours of the truck just sitting and not driving. My truck is my daily driver, so as long as I drive it every day and a half or so, no problems. In May, I put 175W of solar on the truck and set up the charger to charge my truck battery, and since then the fridge hasn't shut off. I suspect if I parked the truck in direct sun and just left it, I would get about 3 or 4 days before the low voltage cut out kicked the fridge off. Once the fridge kicks off, I still have no issues starting the truck. FWIW, my fridge has no issues getting down to temp. The couple times I've turned it off to move it, when I turn it back on it'll go from mid 90's down to 37 in an hour and a half or so. On camping mornings I just take my cold food out of the house fridge and plop it in the truck fridge. no special super cooling or anything.
I had originally planned (and I think I asked questions on here about it) on adding a second battery for camp stuff, and a DC to DC charger as well as solar to keep everything topped off. I'd still like to do that, but that's another couple hundred in parts and a weekend or two that I haven't gotten around to yet. In the mean time, running it off the trucks battery works fine, and is like an 80% solution. 90% with solar charging the truck battery.
Pluses of ICECO: I like the brand name compressor. The cheap Amazon fridges have mystery compressors that have bad longevity reviews. Build quality is good enough. I bought the JP series because that's the one that fit in the spot I had for it in the truck, but pushing buttons or opening the lid, you know it's not a Dometic. (it's half the price) If I had had the room I think I would have sprung for the VL series. They seem more robust. A 40 qt fridge holds A LOT more food than a 40 qt cooler, since you aren't wasting space on ice. (duh, but still you'll be surprised)
Down sides: They send you an annoying cover that doesn't seem to do anything. I took mine off and lost it after the first two weeks of arguing with it and it's straps. It ain't cheap, especially if you have (or choose) to upgrade your power situation. It's kinda heavy and needs to be strapped down securely. I had to build a little platform that bolts into the seat mounts, and I'm on revision three of that to get it just "so". It should really be inside and that take sup space in a smaller vehicle. I see people with them in their truck beds, but the condenser and compressor cooling vents will let sand, dust, water, and muck get places where they shouldn't be. I am skeptical of outside fridge long term lifespan.
That's about it. I'm still dialing in exactly how I want mine to sit in the truck, but over all I'm really glad I have it. It's a little bougie to be out camping in the middle of nowhere, and pop an ice cold beer to watch the sunset while chilling under my awning, but it sure is peaceful.
*Last thing, I almost forgot: Since mine is (mostly) always in my truck anyway I also drop my meat, fish, and frozen goods in it for the trip home from Publix. Super handy if I want to make a stop or two while out shopping to not worry about food in the truck.