Toilet heaven is a maze-like building that consists entirely of bathrooms, some of which may spawn medicine cabinets. There are also unique toilet-themed rooms, including a 9 toilet bathroom and a single toilet room.” – Death Road to Canada Wiki

Toilets found in the unique rooms tend to be more liberal in their variety and quantity of supplies, making them a much more lucrative looting experience. The single toilet room will always have 10 food.