True Towing capacity
 

I'm a bit confused, I used the VIN decoder to get details for my truck but could not make sense of the towing capacity for my truck.
I own a 2006 GMC 1500 with 4.8 V8 and 3:43 rear end. I plan to use weight distribution hitch for a travel trailer (not purchased yet)
Info listed on the VIN decoder is 6900, 5900 lbs 4600.0 min 10400.0 max ??? very confusing.
Can someone help me make sense of this data?