We've had an electric cooler for about 15 years now. We first used it in our PUP because it had an ice-box and not a refrigerator. We continued using it through 3 TT's now, and it's still working great! The can be plugged into an automobile accessory plug and it also came with a 120 AC volt converter to 12 DC volt. Then you plug it into that if your not in your vehicle. Turn it sideways and it's actually a small upright refrigerator, turn it on it's back and it's a cooler chest.
Plug in the wire one way and it cools the inside, turn it the other way and it warms the inside.
Once we reversed it the wrong way, and next morning we had hot milk and roasted hot dogs! Guess what we had for breakfast? Hot chocolate milk and hotdogs. The kids got a real hoot out of that!
Now that it's just the wife and I, we don't use it so much any more, but it does come in real handy for drinks.
Since it's just the 2 of us, we usually bring enough food, including cold items, for 2 days out. We plan on visiting grocery stores. This saves space, and keep everything fresh! We're never that far from a grocery store.
This is from Target. Unbelievable, they haven't changed hardly any at all in 15 years: