I have two brompton bikes that load into the baggage area of my J model no problem, through the baggage door. Made some kids seats for them, and the four of us just got back from cape cod and did not get in a car once all weekend.
They ride quite well, even with the small wheels. I would be happy doing 20-30 kilometres on them if neccessary. The tires pressures are 100 psi so they have very little rolling resistance. They also have optional bags that clip on the front that come in very handy. Most restaurants/hotels will let you bring them in because they fold up so small.
