Something like this:



http://www.equinoxtrailers.com/store/item/21

Haven't tried it, but I like the looks of this trailer in so far as it attaches to the rear axle of the bike. Although I would balk at the price.

Seems like I found more a few years ago when I was researching this before I bought my Woody Wagon. I'll keep looking.

The cart part of this trailer looks a lot to me like a Burley Flatbed utility trailer. I have one of those. I could probably make a drawbar long enough for this to work.

Another thing that would probably work is to use the frame of a kiddie trailer for the cart.

This one is another seatpost mount:
http://www.paddlecart.com/biketrailer.html

Ah-ha!! This is the one I was looking for:
http://store.seattlesportsco.com/pro...&idcategory=78
I like the looks of this design, but the manufacturer only rates the carrying capacity at 75 lbs. I think that might have been why I passed on this one when I decided on the Woody Wagon.