Minifridge
A Minifridge can be found in some vehicles such as the RV.
A powered minifridge will reduce spoilage rate to 20% of the spoil rate at 65°F, which is the default temperature everything else is calculated from. Ordinarily the spoil rate doubles or halves for every 18°F above or below this, so during the summer when food left out spoils really quickly (6x as fast) the effect of the fridge is going to be much more pronounced.