When we sold hot dogs and hamburgers out of our food booth we used the extreme 5 day coolers to store perishables. The burgers came frozen so we would put them on the bottom, cover with ice then the hot dogs on top. Even after two days the burgers would still be frozen. Same type of cooler for our non meat items, ice on the bottom and cheeses, lettuce, tomatoes, and condiments on top. We even used one for drinks because of how well the cooler worked.
Worst case scenario you may need to purchase a small NSF certified refrigerator to pass your HD rules. We are looking to purchase a 48” 2 – door unit for our trailer. You can purchase then as sandwich preps, under counter or worktops.