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Selecting trailer ball
Use the correct trailer ball for your application.
2-5. Driving information
Trailer ball load rating
Matches or exceeds the gross
trailer weight rating of the trailer.
Ball diameter
Matches the size of the trailer cou-
pler. Most couplers are stamped
with the required trailer ball size.
Typical trailer ball
Trailer class
size
IV
II and III
I
Shank length
Protrudes beyond the bottom of
the lock washer and nut by at least
2 threads.
Shank diameter
Matches the ball mount hole diam-
eter size.
2 5/16 in.
2 in.
1 7/8 in.
313
2
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