It's been asked about a couple times. A tandem will fit in an Element with some work. The tandem is a 2004? medium CoMotion Speedster. I'm 6'1 and my wife is 5'9 so the bars and saddles look high. The riser on the fork mount allows the brifters to take advantage of the window pocket space. I plan to remodel the fork riser in the fall as well as exploring a mount that will let me remove the rear wheel for longer trips. If you have any questions I'll answer as best I can.
For our Saturday rides my daughter is the stoker so I load my wife's single next to the tandem and my daughter rides in the rear seat.