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Glossary

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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.