2 0 0 8 K n I G h t
21
drIvInG & safety — 2
Pin to ball center should
not exceed 8". Ball mounts
of longer length will
significantly reduce the
weight rating of the hitch
receiver. Observe weight
reduction percentages
that may be listed on ball
mounts longer than 8".
Selecting how much rise or drop a ball mount
will need is relative to hitch receiver height and
height of the towed load with respect to the type
of towing equipment between the motorhome
and towed load.
Weight Distributing Hitches:
A weight distributing hitch uses spring bars of
spring steel to compensate for lack of adequate
rear suspension of the tow vehicle. This type
of hitch is generally used for towing heavier
loads as tongue weight and gross tow weight
increases. The spring bars attach to the hitch
head assembly and the trailer frame.
Hitch Ball:
The hitch ball is what the trailer attaches
to. A hitch ball is available in three common
diameters, 1-7/8", 2" and 2-5/16". The larger the
diameter of the hitch ball, the higher the weight
rating. The diameter of the hitch ball shank also
factors into weight rating. Match shank diameter
with the hole in the ball mount or weight
distributing head. Shank clearance should not
exceed 1/16". There should be at least two
additional threads extending past the nut when
the hitch ball is secure.
Safety Chains:
Safety chains are required by law when towing
any load. The chains and any fasteners used to
attach the chains to the hitch receiver must be
rated for the load being towed. Attach chains
so they crisscross under the towing equipment.
Allow just enough slack in the chains to make
sharp corners. Too much slack will allow the
chains to drag on the road surface. If towed load
should become uncoupled from the hitch ball,
the towing equipment will be cradled by the
safety chains. If the towed load does uncouple,
do not attempt to make a sudden stop and
exacerbate the situation. Apply the brakes with
gentle, steady pressure. Pull over to the side of
road at a safe location.
Tow Capacity and Class Ratings:
Several components may comprise a tow
hitch system. The weight rating of individual
components that are part of the towing system
must be greater than the gross weight of the
load being towed.
Components are classified into weight groups
to help define weight capacity of towing
equipment. Maximum tow capacity is limited
to the component with the lowest weight rating
in the tow hitch system. Example: a ball mount
may have a weight rating of 5,000 lbs. but the
hitch ball is rated 3,500 lbs. Maximum tow
capacity is reduced to 3,500 lbs. Many times
a component will have a Class weight rating.
These groups are shown in chart:
WARNING
Be sure the weight ratings of the ball
mount, tow ball and safety chains are
equal to or greater than the load. The
use of an extension to the receiver or
extended ball mount will significantly
reduce hitch receiver weight ratings.
Modifications to the hitch receiver, or
use of the hitch receiver other than
intended, can void the warranty of the
hitch receiver, chassis or both.
class I
class II
class III
class Iv
class v
weght
carryng
htch
TW - Up to
200 lbs.
WC TW - Up
to 350 lbs.
TW - Up to
500 lbs.
TW - Up to
750 lbs.
TW - Up to
1,200 lbs.
GTW - Up to
2,000 lbs.
WC GTW - Up
to 3,500 lbs.
GTW - Up to
5,000 lbs.
GTW - Up to
7,500 lbs.
GTW - Up to
12,000 lbs.
weght
dstrbutng
htch
---
---
---
TW - Up to
1,200 lbs.
TW - Up to
1,400 lbs.
---
---
---
GTW - Up to
12,000 lbs.
GTW - Up to
14,000 lbs.
Gtw
= Gross Trailer Weight. Weight of trailer fully loaded.
tw
= Tongue Weight. Weight pushing down on Tow Ball.
wc
= Weight Carrying. Weight carrying capacity of the Ball Mount.
wd
= Weight Distributing. Weight carrying capacity of a weight distributing hitch.
Distance from the
top of the shank to
the top of the hitch
ball platform.
020314
Summary of Contents for 2008 Knight
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Page 46: ...driving safety 2 42 2008 Knight Weighing Procedure Worksheet Example Worksheet 020255b conv...
Page 47: ...2008 KNight 43 driving safety 2 Weight Record Sheet Actual Worksheet 020255b...
Page 52: ...driving safety 2 48 2008 Knight Notes...
Page 76: ...exterior interior care 3 72 2008 Knight Notes...
Page 190: ...electrical systems chassis 9 186 2008 Knight engine no start flow chart...
Page 233: ...2008 KNight chassis information 10 229 Notes...
Page 237: ...2008 KNight chassis information 10 233 Battery Specification Charts...
Page 246: ......