My 5 year old son can ride his bike without training wheels pretty well, but when we go on longer trips it's difficult for him to keep up with us. He's interested in riding stoker on our Davidson tandem. Doing a search online I found daVinci and Santana both sell child stoker kits. However, $300 seems like a lot to spend on an experiment.
Does anyone know of a cheaper alternative or have a kit that your children have outgrown? I'd really appreciate it!