This document defines and explains 6 common trucking terms: bobtailing refers to driving a semi-truck without a trailer; deadheading is driving a semi-truck pulling an empty trailer; a reefer is a refrigerated trailer used to transport perishable goods; the cab is the driver's compartment of a truck; GVWR is the maximum allowable weight for a vehicle; and a Jake brake is an engine braking system used to supplement wheel brakes on semi-trucks.
2. Bobtail
Bobtailing means driving a cargo carrying truck (semi-truck) without
a trailer. Bobtailing often happens when a contracted truck driver is
first sent out from dispatch to their pick up site.
3. Deadhead
Deadheading means driving a cargo carrying truck (semi-truck)
pulling an empty trailer. Deadheading often happens when a trucker
returns or backhauls the empty cargo container to the point of origin.
4. Reefer
In trucking, a reefer is a refrigerated
trailer that gets attached to a semi-
truck in order to transport perishables
and other temperature-sensitive goods.
It was originally the ice cream industry
that gave birth to the reefer around
1925. Reefers may also be used for
heated goods.
5. Cab
In trucking, the cab or cabin is the driver compartment of the
truck or tractor. The cab is the area of the vehicle where the driver
sits. It comes from the word cabriolet.
6. Gross Vehicle Weight Rating (GVWR)
Gross Vehicle Weight Rating (GVWR)
refers to the maximum allowable
weight a vehicle has been engineered
by manufacturers to safely carry. This
weight rating is regulated by the
United States federal government and
does not include the weight specs of
any accompanying trailers.
7. Engine Braking (Jake Brake)
Derived from Jacobs Vehicle Systems,
Inc. (Jacobs), "Jake Brake" is most
commonly used in large diesel engines
on semi-trucks as it is an extra
supplement to the friction brake system
on wheels. Jake brakes help to reduce
speed and many truckers use them on
downhill grades and on highway off-
ramps where not prohibited