I vote for the Groton's fisherman attire...oh you mean the seat I don't particularly like the rack mounted children's seats for a variety of reasons. To me the trailer is the best choice, but I can see where it would be a pain having to break it down. Would an different bike like an Xtracycle or perhaps a Bakfiets with the covered front box be an option? I know they are expensive but might be worth it in the long run. Or maybe the American Built Long John? I can't find the link for the Long John. I will search later this evening and see if I can post it for you.

Found it! http://www.catoregon.org/hpm/longhaul.htm
Aaron