I don't know that I'll be very much help because I wouldn't ever drive 7+ hours in the summer with anything in the fridge so I'd plan to buy the stuff I wanted when I arrived at the destination. Our two years of full-time RVLife taught us many things and working within the limitations of the trailer, as well as our own, made for the best adventures. We have a wireless indoor/outdoor thermometer and we keep the outside node in the fridge and the "base" unit up on the console so we could monitor the fridge as we went. Always in propane mode while traveling with the fan on to vent the spent fumes out for best results. We could monitor the fridge easily enough but it is easy for it to run up in warm weather. This is why I can't offer more assistance because if it was in the heat of summer we were on Interstate 90 or higher.
The best to you,
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