Trailering and Launching
10-3
HITCH BALL AND TRAILER COUPLER
Most boat trailers have a coupler that connects to a hitch ball attached to the
towing vehicle’s hitch. The trailer hitch coupler must always match the size of the
hitch ball. The correct hitch ball diameter for the coupler is usually marked on the
trailer coupler. WARNING! Never use a hitch ball size or rating that does not
match the trailer coupler specifications.
Trailer hitch balls are sized and rated for use based on the trailer GVWR:
Figure 2
Figure 10-2
Trailer Class GVWR
Hitch Ball
Diameter Size
Class One
under 2000 lb
(907 kg)
1-7/8 in. diameter
size
Class Two
over 2000 lb (907
kg) and under
3500 lb (1588 kg)
2 in. diameter
size
Class Three
over 3500 lb
(1588 kg) and
under 5000 lb
(2268 kg)
2 in. diameter
size
Class Four
over 5000 lb
(2268 kg)
2-5/16 in.
diameter size
KC-0043C-A
SOCKET
RELEASE
HANDLE
TOWING VEHICLE
HITCH
PROPER SIZE
HITCH BALL
CLAMP
TRAILER
COUPLER
RELEASE HANDLE
LOCK PIN
LATCH
Supreme_2018.book Page 3 Wednesday, January 31, 2018 9:30 AM
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