A bit heavier duty than the sides, but yes....... if I remember right, most kid trailers like this (this one designed to hold two small children) are rated at 80 - 100 pounds. I actually had all 3 of my dogs in this trailer for a short ride around a campground one evening. I know I was pushing the load limit (and their comfort level), but we kept the speeds very low, and the ride only lasted 5 minutes or so.

I do inspect the trailer and hitch often. The hitch gets looked at pretty much every time we begin a ride, and at breaks during longer rides. The trailer gets a good inspection prior to longer rides, and a quick glance before shorter rides.

Cooper does have a tether from his collar to the frame of the trailer to keep him from jumping out - he likes to ride, but he likes to greet people (and other dogs) too, and doesn't always think before he leaps.......