J.J.
I got one at Meijer a few years ago. It is very nice, with rain sheild that can be rolled up or put down, lots of ventaliation, and even thought it says room for three and had three harnesses, I pull my one child, 3 and he loves it. If I fall, it has a mechanism that the trailer hitch will simply swivel and I fall and he stays up right. Simple attachment, simple storage, simple fold down, sturdy and has a orange flag attached. I don't remember the name, but I bought it for under $100. Oh, there is even room for storage behind the seat and a pocket for drinks for the kids inside. My son takes his blankey, sometimes his favorite toys. Very reflective and had big wheels. Check around, you will find a light weight one (mine is like 5lbs or something), versitile, safe, and not spending the huge amounts of money.
Good luck and happy biking!