Towing a enclosed trailer & deck combo???

I am looking for what other people are doing to extend the length between truck and trailer. So this is what I have..... 2012 Chevy Silverado with a 6.5' bed, I run a 8' deck and the sleds stick out from the deck another 3' or so, a total of roughly 5' sticking out from the bumper. The trailer is 21' in total length and will hold 3 sleds, the tongue is 22" from the center of ball to the front of the trailer nose. The receiver that comes stock on the truck is the 2.5". Is anyone just using a longer stinger? Is an after market tow hitch necessary? Are you extending the tongue on the trailer itself?

Thanks in advance, any suggestions (preferably first hand experience) are helpful.

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