Toyota FORTUNER 2021 Owner's Manual page 177

Selecting a trailer ball
Use the correct trailer ball for your application.
Trailer ball load rating
1
Matches or exceeds the gross
trailer weight rating of the trailer.
Ball diameter
2
Matches the size of the trailer cou-
pler. Most couplers are stamped
with the required trailer ball size.
Shank length
3
Protrudes beyond the bottom of
the lock washer and nut at least 2
threads.
Shank diameter
4
Matches the ball mount hole diameter size.
4-1. Before driving
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