If you can make your own hidden hitch like the one greyphart posted, it should work, and of course look great.
I bought the Hidden Hitch made by Denray Hitches out of Canada, and it wouldn't work with my tires. It would rub both sides of tire. Others have used it with no problems.
I have spokes, and was running Dunlop Cruise Max. The Hidden Hitch fits inside the rear fender brace, so clearance is limited. Very good quality hitch though.

I also had a MCHitch for my Roadstar,and again very good quality hitch.

The only problem with both of these hitches is they do not have the side arms. Work great pulling most lighter weight trailers, but not stable when you try pulling a heavier trailer, or camper.

The MCHitch would be a good & inexpensive choice. If you see you need a little more stability, you can always make a set of side arms later.

I now have a MCHitch for a Royal Star Venture, and it is very stable pulling a camper, because of the way the hitch bolts to the RSV saddlebag brackets. On a good road, I can run 70-75, and forget my camper is back there. At least until I have to stop.