Chuck,

I researched the PlentiKool some more, and it looks like it is well insulated. Are you basing that comment on the PlentiKool specifically, or another brand of cooler?

For our needs (day trips), none of the other downsides you mentioned are a factor. But that one is, and in a big way. We would absolutely need the cooler to have good insulation, as there will be 3-4 hour periods where the unit is not powered.

Thanks,
JAS