A what? Oh, I see. The hip, new, cool name the industry has applied to station wagons.

You can (probably? maybe?) get the bike and both of you inside the station wagon and close the hatch if you have quick-release wheels, (which knocks the Kent out of the running! Stick with the "$200 vintage craigslist tandem". Better bike anyway.)

You have a split back seat as well as bucket seats up front. What most people do is knock off both wheels, put down a protective cloth, fold both right seats, and have the stoker sit behind the driver, just like you would do on the tandem.

Total price - a shower curtain or other grease resistant drop cloth.