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Glossary
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 elec-
tric 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.
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 re-
ferred 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.
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 show-
ers. 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.
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