An interesting and amusing, if frustratingly errata-ridden, article on Radagast the Brown's rabbit-drawn sledge, which appears in Peter Jackson's "The Hobbit: An Unexpected Journey."
Epic fail: Radagast has his gangline attached to his brush bow. This is a sure way to have your super-powered Rhosgobel Rabbits pull your sled apart. [A proper] gangline is attached by way of a network of rope, called a bridle, to every upright “stanchion” on the sled, spreading out the stress. I have since seen some clearer pictures of [Radagast's] sled; it appears to have a support “keel” down the center[;] the brush bow attaches to this keel. Perhaps this is enough to strengthen it.
Opba'n Gangline Style!
The article also covers much that Radagast gets right.