1. Small Tankers: These are typically used for local fuel deliveries and have capacities ranging from 1,000 to 5,000 gallons (3,785 to 18,925 liters).
2. Medium Tankers: These are commonly used for regional fuel distribution and have capacities between 5,000 and 10,000 gallons (18,925 to 37,850 liters).
3. Large Tankers: These are used for long-distance fuel transportation and can have capacities exceeding 10,000 gallons (37,850 liters). Some large tankers may have multiple compartments to carry different types of fuels.
It's worth noting that regulations and industry standards regarding the capacity and design of gas tanker trucks can vary in different countries and regions. Additionally, some tanker trucks may be customized to meet specific requirements or preferences of the transportation company or fuel supplier.