I used that exact setup. My Roadmaster baseplate was the XL. When I take off the crossbar and the two gizmos with the pins, the front of the car is clean! You have to look really hard to even tell it's set up to tow!
Be sure the kit includes the light that mounts in the MH to show the toad brakes are being applied. You will like the ReadyBrute Elite!
Good luck, happy trails, and God bless!