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Glossary

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T

T
TIRE RATINGS The MAXIMUM LOAD that a tire may carry is engraved on the sidewall, along with a corresponding COLD inflation pressure. A reduction in inflation pressure requires a reduction in load rating. Tire manufacturers publish charts that establish the load capacity at various inflation pressures.
TOE (WHEEL ALIGNMENT) Toe is the measure of whether the front of the wheels (looking down from the top) are closer (toe-in) or farther (toe-out) than the back of the wheels.
TONGUE WEIGHT, TONGUE LOAD, VERTICAL LOAD (TWR/TLR/VLR) Tongue Weight, Tongue Load, Vertical Load Rating Different terms for the MAXIMUM VERTICAL LOAD that can be carried by the hitch UNLOADED.
TRAILER BRAKES Brakes that are built into the trailer axle systems and are activated either by electric impulse or by a surge mechanism. The overwhelming majority of RVs utilize electric trailer brakes that are actuated when the tow vehicle's brakes are operated, or when a brake controller is manually activated. Surge brakes utilize a mechanism that is positioned at the coupler, that detects when the tow vehicle is slowing or stopping, and activates the trailer brakes via a hydraulic system (typically used on boats).
TRAVEL TRAILER (TT) Also referred to as "conventional trailers," these types of rigs have an A-frame and coupler and are attached to a ball mount on the tow vehicle. Travel trailers are available with one, two or three axles. Depending upon tow ratings, conventional trailers can be towed by trucks, cars or sport-utility vehicles.

U

U
UMBILICAL CORD Wiring harness which connects the trailer to the tow vehicle during transport. The umbilical cord supplies the trailer with DC power for charging the batteries and operating DC equipment. It also operates the trailer brakes and signal lights. (Also referred to as the 7-way power cord.)
UNDERBELLY The RV's under-floor surface, which is protected by a weatherproofed material.
UTQGL (UNIFORM TIRE QUALITY GRADE LABELING) A program that is directed by the government to provide consumers with information about three characteristics of the tire: tread wear, traction and temperature. Following government prescribed test procedures, tire manufacturers perform their own evaluations for these characteristics. Each manufacturer then labels the tire, according to grade.
UV DEGRADATION A breaking down of material due to the sun's harsh ultraviolet rays.
UNLOADED VEHICLE WEIGHT (UVW) The WEIGHT of a vehicle as built at the factory with full fuel, engine (generator) oil and coolants. It does not include cargo, fresh water, propane, occupants, or dealer installed accessories.

W

W
WALLY WORLD Slang term used by RVers to describe a Wal-Mart.
WASTE WATER TANKS The gray water tank holds the waste water from the sinks and showers. The black water tank holds the waste from the toilet.
WATER PRESSURE REGULATOR Device (customer supplied) installed on the water hose attached to city water to limit the water pressure entering the RV. Most regulators limit water pressure to 40 psi.
WEEKENDERS People who own their RV's for weekend and vacation use.
WEIGHT & LOAD These terms are generally used interchangeably. For the purposes of understanding RV applications, vehicles have WEIGHT, which impart LOADS to tires, axles and hitches. Scale measurements taken when weighing are LOADS carried by the tires. These measured loads are used to calculate Gross Vehicle Weight (GVW), Gross Axle Weight (GAW), Gross Combination Weight (GCW), and hitch loads.
WET WEIGHT The weight of the vehicle with the fuel, freshwater and propane tanks full. Note:
  • Propane weighs 4.25 pounds per gallon
  • Water weighs 8.3 pounds per gallon
  • Gasoline weighs 6.3 pounds per gallon
  • Diesel fuel weighs 6.6 pounds per gallon
WIDE BODY An RV having an external body width greater than 96 inches (8 feet). The most common wide-body widths are 100" and 102."
WINTERIZED Refers to a camper that has been prepared for storage. The water systems have been drained and RV antifreeze has been added to protect the water lines and drains. The low point drains should be in the open position.
WORK CAMPER A person living in an RV and working. Many spell it as "workamper" after the web site and service by that name.

Y

Y
YAW Fishtailing action of the trailer caused by external forces that set the trailer's mass into a lateral (side-to-side) motion. The trailer's wheels serve as the axis or pivot point. Also known as "sway."