Few mods/accs (DIY) in my Sportsmen 16BH (LOT PICS!)

I strongly suggest you return the rack and get a Swagman brand carrier. They are designed for RV use. The one you have will break at the hinge point.
Also you need to reinforce the bumper by adding some angle iron that spans from under the frame and continues under the bumper. This will prevent the bumper from pulling downward.

Here's a pic of mine, the new angle iron is cut off at a 45 degree angle. It doesn't take much to make the bumper much stronger.