Seating layouts in a Trike come in four different forms. Single seat, middle. Tandem seats, middle. Side by side seats and One Front Middle, Two Rear. Other than those configurations, the only thing you can do is to move the position of the seats forward or backward depending on whether the trike is a delta (one wheel forward and two rear) or Tadpole (Two wheels forward and one wheel rear). Is one configuation better than the others? Which one is right for your trike?