Step 9Upper Beam construction
Cut the fence post length to match the width of the truck bed minus the Expansion Hardware (in this case 4' 8"). This may be an iterative process. Start with the post a little long and as the Expansion Hardware is added to the ends, shorten the post.
The concept is that the threads on the plumbing fitting will be used to adjust the length of the beam to act as an expansion rod between the sides of the truck bed.
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