So you're disagreeing with something I said? I don't see where I ever said it was legal for people to ride in a trailer. Do I need to state it's not legal even though I never said it was? And yes the Disneyland trams are a good example of a trailer designed to carry people. Michigan law was just defining what a trailer was in their interpretation, there was no mention of it being street legal. There are in fact trailers designed to carry people. You would have to look at other laws to determine if those trailers are legal or not to be operated on the street in any particular state.