Wondering if anyone has done their own siping of tires? I have the BF Goodrich A/T's and thought I might get one of the Ideal Groover siping toolsm (http://www.idealtiregroover.com/products/Ideal-Tire-Groover.html) to sipe the tires. Thought I would see if anyone here has done this on the tires of their Sprinter. Granted the tires on my Sprinter are a little more aggressive than normal tires. Any thoughts?