I'm interested in others' experience as well as bikes and seats that were used. My commute will likely go this way at some point in the future but with a folder and a carbon racing bike I currently don't have a suitable bike, though our Burley trailer has led to many fun family rides. I'm curious especially about how a big a kid can go on a rear seat in practice. There seems to be a dizzying array of rear seats available with different retention systems and weight ratings. Thanks in advance.