A bicycle trailer is a motor-less wheeled frame with a hitch system for transporting cargo by bicycle. It can greatly increase a bike’s cargo capacity,

allowing point-to-point haulage of objects up to 4 cubic yards (3 cubic meters) in volume that weigh as much as half-a-ton.  Below are some advantages cited for the use of bike trailers:

1. Trailers are more stable and affect the handling of the bike much less that bike seats. Trailers with chain stay (rear triangle) hitches affect bike handling less and are probably less likely to tip, than trailers with seat post hitches.
2. Trailers also have the advantage of being able to carry larger children (1-4 years) and multiple children. (several trailers are rated to 45 kgs. or 100 lbs.)  Kids can be set-in the trailer with toys, books, drink, food and other amusements.
3. The fact that the child is surrounded by so much entertainment and can nap in comfort in their royal coach, the child can accommodate longer trips.
4. Trailers can provide more weather protection against rain and sun.
5. Sitting low, with a low center of gravity, falls are rare and short.
6. The typical brightly colored fabric used on trailers is very visible to motorists.
7. The down side is that the child sit low and has a restricted view.
8. Trailers have a larger foot-print, which may be a problem on narrow roads and in congested urban areas — instead of sharing a lane, you are more likely to have to take-up a lane for safety.
9. Rather than inciting harassment, trailers more often seem to generate friendly curiosity.
10. The best trailers have the added safety features of a five-point harness and roll-bar.
11. Face forward designs allow easier communication between the cyclist and the child, than rear facing designs.
12. The child is also easier to monitored with the use of a handlebar bar-end mounted rear view mirror.