2 • 87
Driving & Safety
2004 • LaPalma
Cargo Carrying Capacity:
When weighing the motorhome it is important to understand that each
motorhome, even of the same model year, floorplan and length will weigh
different due to options and accessories. The Gross Vehicle Weight Rating
(GVWR), Gross Combination Weight Rating (GCWR) and/or Gross Axle
Weight Rating (GAWR) must not be exceeded.
GVWR of the vehicle limits the weight of the entire load
combination, regardless of the mix of water, LP-Gas, passengers, or cargo.
It is important to understand the weighing process is performed in two
phases. The first phase is determining the Cargo Carrying Capacity
(CCC) and the second to ensure the GVWR is not exceeded when adjusting
tire pressures. The weighing process should start by recording the GVWR
from the Federal Weight Label, then weighing the motorhome unloaded,
without passengers and with a full fuel tank. Engine and transmission fluid
levels must be full. This is known as the Unloaded Vehicle Weight (UVW).
Once this weight has been recorded it can be subtracted from the GVWR.
Next, begin to calculate the Cargo Carrying Capacity (CCC).
Fresh water weight and LP-Gas weight can now be subtracted from
the remaining total line A.
• Water weight is the number of gallons multiplied by 8.3.
• LP-Gas weight is the number of gallons multiplied by 4.2.
A 10-gallon water heater with a 40-gallon fresh tank would total 50
gallons times 8.3, or 415 pounds.
A 30-gallon LP-Gas tank will have 24 gallons of LP-Gas due to the 80%
liquid capacity. This would mean 24 gallons multiplied by 4.2, or 100.8
pounds.
Next, calculate the Sleep Capacity Weight Rating (SCWR). The
manufacturer's designated number of sleeping positions for the motorhome
multiplied by 154 pounds.
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