Questions: Tow Capacity '02 1500 4.7l Quad 4x4

[ELCO5280]

Hey all I know this is a redundant question but I'm looking for the tow capacity for my '02 1500 Quad Sport 4x4 4.7l 4-Auto w/ 20" wheels and a tow package.

Here's where my confusion sets in because I get 3 different answers:
From my operator’s manual:
Axle Ratio: 3.90
GVWR: 6,650 (Total weight of truck with the max payload of 1380 lbs)
GCWR: 11,500 (Total weight of truck and trailer w/ load)
Max. Trailer Weight: 6,100 lbs.

From the Dodge Towing Site
With Axle Ratio - 3.92 Axle Ratio You Can Tow 7150 lbs (My truck is 3.90)
Gross Vehicle Weight Rating (GVWR) = 6650 lbs
Payload = 1453 lbs
Curb Weight = 5197 lbs
Curb Weight Front/Rear = 3028 lbs/3028 lbs
GAWR Front/Rear = 3900 lbs/3900 lbs
Gross Combination Weight Rating (GCWR) = 12500 lbs

and from TrailerLife Site
1500 Quad Cab 4WD 4.7 V-8 7,150d,g
1500 Quad Cab 4WD 4.7 V-8 6,100d,g*
d=four-speed automatic; g=3.92 axle; *With optional twenty-inch wheel and tire Sport Group

User guide shows 3.90 Axle ratio but the other 2 sites show a 3.92 w/ a 1k lbs difference. Is it due to the 20" wheels that my capacity is reduced by 1k lbs?

Thanks for any clarification!

EL