I don't have one, but I can tell that "it depends". You can download an owners manual for the year you are looking for from the Chevy or GMC web site.
What I can tell is that in 2008 and 3:73 gears the 6.0 added 1k# additional capacity. But with the trailering performance package that number jumps another 2k# depending on configuration (crew cab, 4wd, etc), and increases the GCVWR.
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Chuck
2013 Jayco Jayfeather X20 E (sold)
2016 Chevy Silverado LTZ 2 Z71 Crew Cab (sold, and dearly missed)
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