I copied this from the summit racing website.. Sounds to me like it will handle it...
"Mile Marker builds these Extreme winch mounts to handle the extreme tension that their winches can create! Tested to the extreme, they incorporate a thick mounting steel plate and steel bar, which are fully welded to the vertical upright mounting brackets. This creates an extremely strong "box structure" capable of withstanding the 12,000 lb. force that Mile Marker winches produce."