Understanding motorhome weights
You've probably heard it said that a chain is only as strong as its weakest link. This theory
applies to motorhome chassis as well.
The chassis manufacturer establishes weight ratings and limitations based on the major
components of the system — the engine, transmission, brakes, axles, tires and frame. These
components are designed to accommodate a particular weight, and if they are overloaded,
their life expectancy diminishes rapidly.
So, it is important for motorhome owners to understand the various weight definitions used
by motorhome and chassis manufacturers. Of course, the next step is to have your
motorhome weighed after you have loaded it for travel to make sure it falls within the
various ratings.
Weight definitions
GVWR (gross vehicle weight rating): the maximum permissible weight of the fully loaded
motorhome, including liquids, passengers and cargo. The GVWR is equal to or greater than
the sum of the unloaded vehicle weight (UVW) plus the net carrying capacity (NCC).
GCWR (gross combination weight rating): the value specified by the motorhome
manufacturer as the maximum allowable combined weight of the motorhome and the
attached towed vehicle.
GAWR (gross axle weight rating): the maximum allowable weight each axle assembly is
designed to carry, as measured at the tires, including the weight of the assembly itself.
GAWR is established by considering the rating of each of its components (tires, wheels,
springs and axle) and rating the axle on its weakest link. The GAWR assumes that the load is
equal on each side of the vehicle.
RVIA weight label
In September 1996, the Recreation Vehicle Industry Association (RVIA) established a
requirement for its RV manufacturer members to disclose weight carrying information that
would assist both a buyer and an owner in understanding and complying with weight
limitations of motorhomes. The following terms and their associated weights are reflected
on a label, found in a cabinet inside the coach.
UVW (unloaded vehicle weight): the weight of the motorhme as built at the factory with full
fuel, engine oil and coolants. The UVW does NOT include cargo, fresh water, LP gas,
occupants or dealer-installed accessories.
NCC (net carrying capacity): the maximum weight of all occupants including the driver,
food, tools, LP gas, fresh water, personal belongings, dealer-installed accessories, and the
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