Haff, what did you end up doing? I know you said you called the manufacturers of the trailers, and they said NO CHILDREN UNDER 1 YEAR OLD. My opinion is, of course they're going to say that, because they don't want to get sued if a kid gets hurt.
Anyway, if there is anyone out there who did put a baby bucket in a trailer, how do you secure it? My concern is not that it won't be safe in there for the baby- if she's in a bucket, and the bucket is secured well, she's not going to get jostled around. My concern is securing the seat in the trailer so it doesn't go flying out of the trailer or so the bucket isn't jouncing around in there. If the bucket can be secured nice and tight, I don't really see a problem with putting the bucket in the trailer.
Anyway, if anyone has any further thoughts on the matter, please let me know. I haven't had a chance to ride since the winter, and I am DYING to get out on the bike....