I put a set of Nitto Exo Grapplers on my '11 F250/6.7L PSD in Jan. They're fantastic in both deep snow as well as hard-packed snow/ice. I have them on a 2nd set of rims and took them off in May. I'll put them back on in Oct or so. I put about 5K mi on them last winter. They're superior to BFG KO 1 & 2, Nitto Trail Grapplers, and Dura-Tracs for winter performance in particular as I've had them all on either my current truck or my previous '06 F-250 diesel.
