Dee Zee DZ17221 - Manual (Page 6)

Measure the distance across the bed of the truck at the tailgate pivot point.
Subtract 1/4" (6mm) from the measurement taken. Set the lower truck brackets at this dimension.
Make sure that the brackets are at this dimension and centered from left to right on the bed extender.
Tighten the nuts [I] with a 13mm socket.
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