We have the Instep Quick-n-ride. It runs around $100-$150. It has the universal mount, conversion to stroller, pockets inside to hold juice cups/snacks, collapsable, storage in the back for bags of groceries, diaper bag, bread to feed the ducks, etc. We fit two kids (4 and 2) in it fine - with their helmets on. It's held up fine over the past year. My son loves to get in and hates to get out. Any trailer you pick - I'm sure the kid(s) will love!

The most important thing.......Make sure you get a helmet for your daughter. Finding a helmet to fit a little munchkin can be difficult. None of the toddler helmets at Sports Authority and the like fit my son when he was around 15 mos, so we ended up at the LBS with a Specialized helmet that was fully adjustable. He'll be able to wear it forever! I'm guessing he'll choose something different from the blue helmet with pink flying pigs on it when he get a bit older, though. Yes - flying pigs. I have no idea...