Factory hitch rating?

[Teligence]

My rig came equipped with the "AHC Trailer Tow Group", but I can't find the weight/class ratings on the hitch itself. "339" is stamped on each side of the square receiver tube, and "42 02" is stamped above the left safety chain hole.
These are only 2 sets of numbers stamped on the hitch that I can find.

How can I determine the max tongue/tow weight of this hitch?

 

[MADDOG]

It was spec'd as a Class IV hitch:

https://www.factorychryslerparts.com/products/Dodge/RECEIVER-KIT-Trailer-Tow/4381212/52110373AG.html

1. Class IV hitches used as weight carrying are rated up to 10,000 lbs. gross trailer weight (GTW) with a 1000 lbs maximum trailer tongue weight (TW).
2. Class IV hitches used for weight distributing are rated up to 14,000 lbs. gross trailer weight (GTW) with a 1400 lbs. maximum trailer tongue weight (TW).

https://www.reese-hitches.com/learn...Class IV hitches used as,GTW) with a 1400 lbs.