3.1 Unloaded Tractor-Trailer Weight Characteristics

The tractor-only weight is typically around 20,000 lbs. It will vary somewhat depending on the configuration (e.g., day versus sleeper cab, engine size). Specific weights are sometimes provided at tractor truck manufacturer web sites, within the specifications of the various models offered. Some weights can also be found on trucking web sites that provide reviews of tractor truck models (e.g., https://www.trucknews.com/transportation/test-driving-peterbilts-model-579/1003123738/#Spec%E2%80%99%20Sheet).

Unloaded trailer-only weights vary significantly by the type of trailer, but are in the range of 10,000 lb.

Thus, the combined unloaded tractor plus semi-trailer weight is in the range of 30,000 lb.