drIvInG & safety — 2
0
2 0 0 8 K n I G h t
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
limits the weight of the entire load
combination, regardless of the water, LP-Gas,
passengers and cargo weight.
It is important to understand that the weighing
process is performed in two phases. First, by
determining the
Cargo Carrying Capacity
(CCC)
; and 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
.
Gvwr 22,00 - uvw 1,300
= a 8,200
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 lbs. A 30-gallon LP-Gas tank will have 24
gallons of LP-Gas due to the 80% valve. This
would mean 24 gallons multiplied by 4.2, or
100.8 lbs.
a 8,200 - 81 = B ,19
B ,19 - 100.8 = c ,18.2
Next, calculate the Sleep Capacity Weight
Rating (SCWR) the manufacturer’s designated
number of sleeping positions for the motorhome
multiplied by 154 lbs.
The 154 lbs. (70kg) is the average weight
established by the U.S. Federal Government and
Transport Canada, and is used to arrive at Cargo
Carrying Capacity (CCC). However, actual sleep
capacity weight may be greater. The
SCWR
is
not intended to limit the sleeping capacity to a
specified weight.
Example:
If the manufacturer has designated
the motorhome sleeping position at 4 (616 lbs.)
and there are four people who weigh 200, 200,
178 and 138 lbs., totaling 716 lbs., that doesn’t
mean the sleeping capacity is reduced to three
individuals, but rather the CCC is reduced by 100
lbs. due to the actual passenger weight.
c ,18.2 - scwr 0 = ccc ,8.2
020255b conv
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