TOYOTA 2011 Tundra - Manual (Page 292)

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2-5. Driving information
n Unbraked TWR (Unbraked Trailer Weight Rating)
The trailer weight rating for tow-
ing a trailer without a trailer ser-
vice brake system.
n Tongue Weight
The load placed on the trailer
hitch ball. (
→P. 275)
n Kingpin Weight
The load placed on the 5th wheel
mount or the gooseneck ball.
(
→P. 275)
(Without brakes)