I have pulled a bob, bikes at work trailer, a burley flatbed and a kid hauler.

The bob is completely worthless. It shakes on downhills and anytime you do not have anything placed in it just right. I honestly do not understand why people like them. They have become "cool" somehow like brakeless single speed bikes. I think most people who have them have never pulled anything else.

So in conclusion, they are worthless and dangerous.

The bikes at work trailers are the best simply because you can haul furniture or anything on them but the burley flatbed with a 40 gallon rubbermaid container will hold a full cart of groceries with no problem.