A am assuming you mean an 1 1/4" hitch?
Orbital Machine Works makes custom hitches for Casita's and Scamps
. But the one I got for my Scamp
was a 2" receiver... if you ask nice perhaps they will do one with an 1 1/4" for you. The hitches are designed specific for a Scamp
and they are very well done and they do an amazing job of packing them so they are not damaged during shipping. I don't recommend using one of those slide in receiver reducers but I think you will find most of the better racks these days come with some sort of adapter you can use a 1 1/4 rack on a 2" receiver.