definitely make sure the bike can tow a trailer. i tow my son in a trailer on my mountain bike and it works fine i can even take him on trails! but a road bike would work well too. realize that towing little ones and training will not be that compatible unless they really like the trailer or if they like napping (and can nap at the same time) in the trailer. i have a friend who can watch my son a few hours a week and my husband watches him some on weekend i probably manage 6 hours on a good week right now and most weeks maybe 3 or 4 hours. that's not pulling the trailer and on my luna. pulling the trailer it ranges from zilch to an hour a day or more but that is completely dependent on my son and usually i am taking him fun places like berry picking or playground. one thing i have discovered is that now that he can ride a balance bike he loves to go to the playground he can ride his bike and i can ride my bmx around! really fun. that can keep us both entertained for a long time. now that school has started we can't use the elementary school with the big blacktop unless it is weekend or after school. i am looking forward to school holidays so we can play on that blacktop.

you may want to choose what trailer you will be towing so that you can be certain the hitch will work with your new bike.