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GVWR Gross Vehicle Weight Rating 
The maximum permissible vehicle or trailer weight, including all cargo, fluids, passengers, and any and all optional equipment.

You need this number to determine if you are within the limits set forth by the manufacturer, laws, and regulations. The only way to be sure you are within the rating is to drive the RV on a scale and measure it.

GCWR: Gross Combination Weight Rating
The maximum permissible combined weight of the tow vehicle and the attached towed vehicle. This assumes both vehicles have functioning brakes, with exceptions in some cases for very light towed vehicles, normally less than 1,500 pounds.

UVW Unloaded Vehicle Weight
Sometimes referred to as the Gross Vehicle Weight or Curb Weight, the UVW is the dry weight of the trailer as manufactured at the factory.
HW Hitch Weight
Hitch Weight represents the portion of the trailer weight that is carried by the tongue to the hitch ball on the tow vehicle.
CCC Cargo Carrying Capacity
Sometimes referred to as Rated Cargo Load, the CCC is equal to the GVWR minus each of the following: UVW, full fresh water weight (including water heater) plus filled propane tank(s) and battery weight.
For safety's sake, the CCC should never be exceeded.
Tongue weight The downward weight applied by the trailer on the hitch ball. It is usually suggested that tongue weight should usually not be more than about 10% of the gross trailer weight.
MSRP Manufacturer's Suggested Retail Price
Notice that the "S" in MSRP is short for "suggested," meaning that this is only the recommended price. A dealer is perfectly free to charge more or less if he chooses.

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