I spoke with several bike shops and they told me that they are no longer manufacturing tandem trailers because of "legal issues". I have seen them on the streets so they are still apparently legal to use. THe quad bikes I have seen but seem too bulky for me to set up and for recreational use and I want to be the one to be trailing the children since my wife is not into cycling as much as I am. By the way, I will not be taking the kids on the streets, more on trails and bike paths.