I'm very happy to have found this thread. Exactly what I was looking for. I'm thinking about getting rid of my sport bike, since I pretty much never ride it anymore, and replacing it with a SS. The only reason I don't ride the bike is because I take my daughter, who is 2 1/2, to day care every day because it's a block off my drive to work. To ride the bike I have to take her to day care, go back home, gear up, then ride to work, then ride home, get the truck, and go pick her up. Too much hassle. Last summer (when she was a year and a half) my wife bought a RZR, and we strap her car seat into it and she loves it.
I believe that Colorado will not require a car seat, since it's classified as a motorcycle, but we do have a helmet law for anyone under 18. I'd be happy to get her a helmet and always have a 5-point car seat in there.
The question is, do the SS seat belts act like a normal car seat belt where you pull them all the way out, then they ratchet-retract to lock the car seat in place?