Sadly they do not use "Super insulation" an inch or two of Super Insulation and so long as you keep the door closed an cup of ice cubes would never melt (Ok perhaps not quite that good) And the fun thing is super insulation is super easy to make
Aluminum foil/paper/aluminum foil/paper repeat 1000 times. Or there abouts
Since they use more normal stuff.. Yes the temp OUTSIDE the box will affect the ability of the cooling unit to keep the INSIDE cool The hotter it is OUTSIDE (Both inside and outside the RV) the harder the cooling unit has to work. and eventually it can no longer keep up.
THis is why the old joke
When you chocolate bar melts in the fridge.. It's August, and you are in Arizona.
