It's not factory, so you will likely have tough time finding a rating. While the hitch may have a 3500 lb. rating, the actual rating will depend on how it's installed. You also need to consider the total weight rating of trailer and the tow vehicle of course. How is the hitch installed? How much does the trailer & load weigh? Also, the tongue weight on the back will reduce the tongue weight at the front.
2011 Chevy Silverado Crew Cab 4X4
2009 210 WBS