We're missing going for bike rides since dd came along 12 wks ago. My parents have offered us their little drag behind trailer. It's one of those that is sort of a little triangular nylon room with a seat with seatbelts. My mom claims you can put an infant seat in there somehow. Does anyone have any experience with that? Have there been major advances in these things in the past 20 years and we'd want a newer one no matter what? What's your favorite way to ride with someone who can't sit up yet (but has good head control)?