Single trailers are much more maneuverable than double-wheel trailers. However once you load it past about half of the rider's weight it can start getting hard to control. Don't let that make you think they are hard to control when loaded properly as that's not the case. I love how easy my BOB Ibex is to control and ride with on narrow roads and in traffic.

For 60 lbs max, in the city, I would highly recommend a BOB.

I would never tour with a double wheel trailer. They force you too far into the lane IMHO.