You can always go with the welded receiver option.
In the thread below, see post #2 for the 2" receiver I had welded to my frame on my Roo 19 and see post #12 for the one I had welded to my Mini Lite 2503S. My dealer's certified welder did both of them.
Installing a hitch on my roo.
As you've seen in the posts above, certain folks always like to raise the warranty issue with doing this, however:
1. The warranty is typically only a year anyway, and
2. I feel the extra steel actually strengthens the frame.
I had the Roo 19 for 3 yrs with no issues and I'm guessing it's still going strong. I've had the Mini Lite for two summers now with no issues.