First you will void your warranty. Dexter does not recommend it.
Hi HelenBell,
If you have a 2015 Bighorn, I'm guessing you might be past the 1 year warranty.
Lippert makes the frames and is pretty squirrelly about putting a receiver hitch on the frame. If your rig were less than 1 year old, which is the length of Lippert's frame warranty, and you had a frame problem, the hitch might possibly complicate your discussion with Lippert. Or not.
That said, as mentioned, a lot of people have had 2" receiver hitches fabricated to hold bicycles.