http://jalopnik.com/5390934/mustang-cover-...-over-tire-wall
Reminds me of an article I saw in SportsCar magazine recently where they built a Showroom Stock racer (Sentra SE-R Spec V) on the super-cheap, and I am almost certain they used a bolt-in "cage". They also managed to exceed the tow rating of the Toyota Tacoma they were using by a healthy margin.