Again, it is more than enough for ME. That BMW Mount looks like you are replacing a lot of the parts you already have. My mount came with grade 8 bolts, I am not worried about their shear strength. I am no engineer but I am confident using this, and would be up to the 6000 lb rating. Im not towing 12k lbs here or anything, nor ever would with my baby. me and two buddies (over 600lbs between us) with the bike, bounced on the thing at the very end, probably 18" from the hitch. Nothing happened. Its cool when the rear air suspension automatically levels though..
BMW has NEVER been known to sell ANYONE more than they needed...