Improperly inflated tires or suspension that is incorrectly loaded can
result in poor fuel economy, poor handling and over-stressed chassis compo-
nents. Vehicle loading affects tire inflation pressure and the load carried by
each axle. Motorhome axle configuration and floor plan styles will require
different weighing procedures.
WARNING: Improperly inflated or overloaded tires can cause a
blowout. An overloaded axle can cause a component failure of the sus-
pension system. Tire blowouts or broken suspension components can
lead to loss of vehicle control resulting in property damage, personal
injury or death.
CAUTION: If actual weight carried by any tire is below the tire chart
weight specification a minimum tire pressure of at least 75 psi. must be
maintained. Tire pressure below 75 psi. can overheat and damage the
tire casing leading to premature tire failure or blowout.
Slide Out Tire Pressure:
A motorhome equipped with slide out room(s) will weigh slightly heavier
on the driver side. Tire inflation pressures between the driver side and pas-
senger side will differ. More air pressure will be required in the driver side
tires due to the added weight on that side.
NOTE: When weighing a slide out motorhome, each tire must be
weighed independently to obtain the correct weight carried by each tire.
Tag Axle Motorhome (Roadmaster chassis):
A motorhome equipped with a tag axle will require adjustment to the air
pressure regulator for the tag axle. Adjustment of the regulator helps main-
tain proper axle weight distribution ratios. The adjustable regulator and
gauge package is located in the engine compartment on the driver side. The
regulator controls the amount of air pressure in the tag axle air bags.
Increasing the regulator air pressure gauge reading increases the amount of
air pressure in the tag axle air bags, which increases the downward force of
the tag axle. Applying more downward force to the tag axle increases the
weight carried by the tag axle. Increasing the weight carried by the tag axle
decreases the weight carried by the drive axle and slightly increases the
weight applied to the front steering axle.
Driving & Safety
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S I G N A T U R E S E R I E S
2 • 4 7
WEIGHING THE
MOTORHOME
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