Can anyone share some experiences with the Adams tandem trail-a-bike? We recently purchased one used, and for a couple of weeks I pulled my 4 yo only with no problems while we waited for an Adams baby seat (supposed to be compatible according to their website) to arrive for my 2 yo. When we added the baby seat to the rear spot (along with the extra 30# or so of second rider), the thing became really unstable. It's a bit better if the baby seat is in front, but then my older daughter has her face too close for safety to the rear of her sister's baby seat. It's also a little better if the baby seat (in the rear) is dropped down so low they can't pedal, but that kind of defeats the point. Everything is tightened down as much as it can be. Have other people had any problems, or have suggestions for improving stability? Even for my husband (weighs about 2x the two kids put together) with the slop he doesn't feel comfortable because it yanks the lead bike about too much.