What are the pros and cons of a 2-wheel cargo trailer vs a single wheel.

With two wheel trailers the weight is centered on the axle of the trailer, leaving only 10% of the load on the rear axle of the bicycle. Therefore a two wheel trailer will affect the side to side handling of the bicycle far less than a single wheel.

On the flip side, the one wheeled Coho will never flip on rough terrain and can navigate through thinner single track trails.