Factory receiver hitch rating

[1Cajun]

The one on mine is a 2.5" is that a class 5 hitch?

[Sabre2870]

Class V Trailer Hitch
Class V hitches is very similar to Class III & IV hitches except for the weight ratings. This style of hitch uses a 2-1/2" square receiver opening. Class V hitches are weight carrying (WC) and weight distributing (WD) hitches. Class V hitches used as weight carrying is rated up to 12,000 lbs. gross trailer weight (GTW) with a maximum trailer tongue weight (TW) of 1200 lbs. Hitches that are used for weight distributing are rated up to 17,000 lbs. gross trailer weight (GTW) with a maximum trailer tongue weight (TW) of 1700 lbs. The use of a ball mount and hitch ball of the same rating or higher is required. To use the weight distribution side of the hitch a weight distribution system is required. Class V hitches attach to the vehicle frame only. Always consult your owner's manual for vehicle rating.

I would say it qualifies

[Sabre2870]

Per the GMC web page the 2008 Duramax is rated for 13000 trailer capacity with 10 to 15% in tongue weight.

[1Cajun]

Thanks Sabre.