Typical crude oil tank trailers have an average capacity of 8,400 to 11,000 gallons but can range up to 12,680 gallons and with a Super B to 16,800 gallons. Most commonly in the southern US region, you will see one compartment trailers with 8400, 8820, and sometimes 9240 gallons capacities. In the Northern and Western United States or Canada, you will typically find trailers with larger capacities pulled with a lead and pup trailer since weight limits are higher in those parts of the country. Read more......