How much does an empty semi truck with trailer weigh?

This varies greatly depending on the type of truck. For example, a sleeper tractor weighs more than a day cab, a refrigerated van trailer weighs significantly more than a flatbed trailer, and so on. I drive a tandem axle day cab Sterling semi (this is a semi tractor with a total of 3 axles and no sleeper), and I pull a 53-foot dry van trailer (this is a box trailer without a refrigeration unit). When I have run it across a scale empty with about 120 gallons of fuel (this will also change weight as fuel weighs about 12 pounds per gallon), the whole truck weighs very close to 29,600 pounds. An empty semi can weigh as much as about 40,000 pounds, leaving room for 40,000 more of cargo before reaching maximum legal weight of 80,000.