My daughter (8) has autism and so will probably never be able to safely ride a bike alone. We currently have a trail-a-bike which she rides with me. However she is getting a little big for it (we have a year or so left on it without some modifications) and also a little over-confident. She will often sit with both feet on one side, or grab the frame instead of the handlebars and ride is like a broom (damn you Harry Potter!). She will also sway side-to-side to make things a little more interesting (for her, makes it near impossible for me to keep a straight line)
As CigTech says, she "loves the go fast" so I really want to keep her on a bike, but as she gets bigger safety is becoming more of an issue.
Anyway, I'm looking for advice about tandems. Would a tandem be more, or less, stable with a semi-cooperative stoker than a trail-a-bike? Anyone ride with a similar child? Thoughts and comments?