I modified my trailer hitch mounted rack to accept our tandem with the front wheel removed, but it still sticks out.
I posted a thread earlier about how I did my modifications to my rack.
After a 14 hr round trip, we had no issues, and have since done weekend local 1/2 hr drive trips to ride different areas.
We are learning there is a method to loading and unloading and use a ratchet strap to stabilize side to side rocking that wouldn't normally occur with a half-bike. The folded rack is not an obstruction, and we leave it mounted on our Honda Civic.