I work at a bike co-op, and we need a bike trailer that can haul bikes to pick up donations. I was thinking of starting with something like this, this, This or this. There are two ways that I could think of to attach the bicycles. The first would be to make a parking-rack style device to wedge the front tire in (sort of like a small version of this), securing it in with a U-Lock. Or, I could take off the front wheel and mount the bike by the front fork ends. In either design, the back wheel would be on the ground. I'd really like to be able to haul at least 2 bikes, but 3 would be ideal, with the trailer narrow enough to ride on a standard-width sidewalk or bike lane.
Has anyone done this before? Any recommendations?