Single tire trailers are the BEST when you're trying not to stick out into traffic! Two tire trailers are great for weight I suppose, but single tires have a less wide profile and will make your life much more pleasant. bike-tent-trailer
From L to R we have, McClellan, Waino, Holliday, Matt Carpenter (Pee Wee Herman), Westbrook above him, Berkman in pink, Schumaker in green, Raffy squating, Lohse in blue gray top hat, Freese with Cat in the Hat, Boggs in hunter orange, Greene in span