What are class 3 flammable liquid weight regualtions?

There aren't any special weight regulations for Class 3 freight above and beyond the regulations for general freight. There is a LOT of Class 3 going down the road at very high load weights--5000 gallons of gasoline, which is what a tanker truck of it holds, brings the truck pretty close to 80,000 lbs., and gasoline is probably the most transported Class 3 commodity out there.