If your trailer has a collapsible design, you can fold and carry it with you however you desire. This is particularly convenient if you travel by car to specific locations to bike, as you can easily fit the trailer in the trunk of the car or the back seat. Of course, you don’t have to de-attach the trailer from the bike each time your kid is done using it if the bike is momstly used for child-parent driving and you drive it around the neighborhood. Just keep it attached at all times and save yourself some time and effort from constant installing and de-installing the bike trailer.