Follow-up from our trip to South Korea. Our Tandem fit in Kia Carnival. I had hoped to be able to remove the middle seats and set them to the side but the car that we rented only allowed for the seats to be folded forward which worked OK.
Separate question, anyone have an EV that can fit a tandem vertically? A friend easily got his tandem into his Tesla Model S and in his new Rivian SUV but only on it's side although in both cases with both wheels on. Wondering if there's an EV that can fit a tandem inside in a fork mount.