Bicycle trailers set lower to the ground and motorist have more difficulty seeing them. Most bicycle carriers come with a tall orange safety flag on back of the trailer. Always make sure the safety flag is attached before heading out on the road.
The ball and socket assembly that hitch the trailer to the bike is an important safety feature. It would be wise and safer to have because the trailer won’t tip over if the bike does.
The wheels should have reflectors and reflective material on cover. Check the stitches in the material and the quality of construction. Covers should be strong, waterproof and protect your child from the sun. Construction should be steel and lightweight.