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if the length of the bedside is even at the top and bottom and the tail gate doesn't line up...I would then say the tailgate is slightly warped.
Do like you do for the doors. Put a block of wood on the left side and gently push on the right till you get it aligned.
I agree, if the bedsides aren't the issue and bed is square then it would most likely be the tailgate needs tweaked. Lay the tailgate on a flat surface and see if all 4 corners are touching
Rezvani's Latest Post-Apocalytic Monster Is a Ford F-150 Raptor Underneath
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