Not sure if there is room underneath, since the Passport has that "trunk" in the rear area and mounting in on the rear door would prevent it from opening.
But I was think about getting a full size 20" tire & rim from either a Pilot or Ridgeline that someone has upgraded their set up, and carrying it in a bag when I do long/camping trips.
Does anyone know if the Passport 20" wheels will have the same bolt pattern and off-set as either the Pilot or Ridgeline?