I say winch. SDHQ makes a behind the bumper winch. I put it on myself. It fits any Warn winch because they all have similar dimensions and the same secure points.
Ok, I think I'm sold on the winch idea, that's really slick
I also went in for an oil change on Saturday and asked the techs there. They didn't know the reason for the manual saying no tire chains so the manager said that he'll email SVT on Monday. If I hear anything I'll be sure to pass it along.