I took my dog Zeke (40 lbs) on the Katy Trail in a kid trailer. He wouldn't have been comfortable in the seat that the kids sit in, so I undid some screws on the bottom and rolled it up around the top bar that holds the seat up. Then, the floor was soft, like a hammock and would have made him uncomfortable over time. So, I put some pillows and blankets in there to stiffen it up. It didn't work that well. If I had had more time to prepare, I would have figured out something stiffer, which I could cushion the edges of so it wouldn't tear up the bottom of the trailer, and that wasn't heavy like a piece of plywood.
Karen
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insidious ungovernable cardboard