Look at the passenger/loading sticker on the door jam. Whatever that sticker lists as the maximum weight of cargo and passengers, subtract that from the 6500 lb GVWR and that's your curb weight.
No need to go to the scales, unless you want the exact front and rear axle weights.
2008 Suburban 2500 3LT 3.73 4X4 "The Beast"
2013 Springdale 303BHS, 8620 lbs
2009 GMC Sierra 1500 Denali (backup TV, hot rod)
2016 Jeep JKU Sahara in Tank, 3.23 (hers)
2010 Jeep JKU Sahara in Mango Tango PC, 3.73 (his)