read the owners manual...
....this is what it shows for the '09 RT.
I use the double loop extensions on top of the handle bar mount, then standard tiedowns at all four corners.
I believe the gentlemen are right
I have been trailer and trucking sportbikes for about 10 yr now. I use canyon dancers on the front bars, a 2nd strap by triple tree and then straps to 2 attach points on the subframe in the back.
That was before I ever had a BMW.
The 1st time I did the same to my RT, and took off down the highway, I thought the bike was going through an exorcisim. Then I wondered If I needed one, from the way I saw the bike bouncing off and on against the straps. As the truck hit a bump in the road, the bars would dip...loosening itself from the tension on the strap and then pop back in place. It was almost a violent action / reaction.
A 20 min phone call to a buddy in Tennessee, and I went back and tied the bike as described above. Securing the front wheel and then the back wheel to let the suspension and bike respond and do it's thing.
I finished the trip just fine. The bike did also.