As long as the frame on your 2015 Heartland RV Bighorn Silverado Fifth Wheel is between 18" - 51" wide I recommend the Curt Adjustable Trailer Hitch Receiver - 18"-51" Wide - 2" Drop - Class III - 2" # C13701. The # C13701 has a 500lb tongue weight rating and 5000lb trailer weight rating, but your trailer may not. I recommend reaching out to Heartland to find the tongue weight and towing capacity of your Bighorn Silverado and use the lower rating between the hitch and trailer.
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