Used to see a guy at Ashton Court who trailered his dogs there and then chained up the trailer and took the dogs off around the trails.
I used to have to drive to the trails because doing a few miles across Bristol there with the dog on a lead was not practical so we got a trailer to likewise but ended up moving out of Bristol before we tried it.
Keep meaning to try it our down here but normally ride from the house. Now she is getting older I might start using it but I suspect she will hate it. Cat loves to sleep in it though.