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You are absolutely right, I could have sworn they had that back rear door measurement somewhere. Closest I can get is seat h points and rear bumper measurements from the "1000" reference line. (pg 53 and 68 of doc) From the 1000 line (center line of front axle/wheels) rear bumper 182.1"...

I've had this bookmarked for a long time - Upfitter Guide for 2005+ GM truck-based vehicles. Upfitter Guide