Nothing actually helpful to add except that the idea of the dog riding in a trailer behind me in traffic makes me nervous for some reason.
I used to take my old German Shepherd up the park in a trailer, and I never got so much respect from passing cars before or since. She was actually in a trailer attached to a tagalong that was itself attached to a kiddy back tandem that had a child seat on the front crossbar. So I managed a dog and three kids on the same "bike". We never went very far, but we would go out on it for a laugh all the time. Going into town and parking it was a bit of a pain though.
I used to take my old German Shepherd up the park in a trailer, and I never got so much respect from passing cars before or since. She was actually in a trailer attached to a tagalong that was itself attached to a kiddy back tandem that had a child seat on the front crossbar. So I managed a dog and three kids on the same "bike". We never went very far, but we would go out on it for a laugh all the time. Going into town and parking it was a bit of a pain though.