Leo, you make good points, but I don't see myself spending hundreds of dollars to get this going. For the time being, I still have a car, and towing her with the bike is mostly for some extra fun, not utility.

I would definitely make it so that she would not stand up. Being a greyhound, she's pretty top heavy already.

Those adult-towing trailers are interesting. They don't look comfortable to sit in, but I could be wrong. I've often wished I could tow someone home from my commuter train station.

By lashing plywood, I meant to the frame bottom, not to the upper part of the trailer.