No - I don't think so.
Unless you plug a load into the socket it shouldn't do anything to the breaker(s).
You just end up with:
So the RV takes Neutral+15ampHot for one circuit, and Neutral+30ampHot for the other circuit.
If the two legs are the same phase then the two hots are 0V.
If the two legs are split phase then the Hot to Hot is 240V, but you have a mismatched 15amp+30amp breaker in-between. I don't think that gives you 45 amps to draw. I think the 15 amp breaker would probably trip quite easily if you tried to draw the ~30amps the Roadster would want.
I could be wrong though... Like I said, I never tried this.