Whether you're using a childseat, a trailercycle or a trailer to take your kids along, you'll probably want to do so on a bicycle equipped with flat handlebars. These are higher and wider than dropped bars and provide more control against the destabilizing forces of the additional weight you're carrying. You feel this the most with a trailercycle. If Junior squirms around a lot, it can be quite difficult to steer a straight course.