Glossary of Trailer Terms

GLOSSARY OF TERMS

GVWR: The Gross Vehicle Weight Rating is the maximum allowable gross weight of the trailer and its contents. The gross weight of the trailer includes the weight of the trailer and all of the items within it (such as cargo and other supplies).

GAWR: The Gross Axle Weight Rating is the maximum gross weight that an axle can support. It is the lowest of axle, wheel, or tire rating. Sometimes the tire or wheel rating is lower than the axle manufacturers rating, and will then determine GAWR. The sum total of the GAWR for all trailer axles may be less than the GVWR for the trailer, because some of the trailer load is carried by the tow vehicle, rather than by the trailer axle(s). The total weight of the cargo and trailer must not exceed the GVWR, and the load on an axle must not exceed its GAWR.

TIRE SIZE: The tire size and load range for your trailer.
RIM SIZE: The rim size and load range for your trailer.
PSI: The tire air pressure (Kilopascals / Pounds per Square Inch) measured with tires cold.
VIN: The Vehicle Identification Number.
VEHICLE TYPE: Model or style of trailer

ST: 
An “ST” is an indication the tire is for trailer use only.

Max. Load Dual kg (lbs) at kPa (psi) Cold

This information indicates the maximum load and tire pressure when the tire is used as a dual, that is, when four tires are put on each rear axle (a total of six or more tires on the vehicle).

Max. Load Single kg (lbs) at kPa (psi) Cold

This information indicates the maximum load and tire pressure when the tire is used as a single.

Load Range
This information identifies the tire’s load-carrying capabilities and its inflation limits

Gooseneck

Trailer that attaches to a ball in the bed of a pickup

Bumper pull

Trailer that connects to a ball hitch that’s attached to the tow vehicle’s frame or bumper. Also called “tag hitch” trailer

5th Wheel
Trailer that attaches to a plate in a pickup

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