considering the 650 is only 125 (or so ) lbs heaver then my 400 what I do should work well for you.
Up front Canyon Dancer and one strap over the passenger section of the seat (with proper protection ).
I do have the wheels "chocked" on the sides with short 2X4 's up front.
If it makes you feel better instead of a strap over the seat slip one (doubled) around the rear tire.
this or the over the seat just stops the rear of bike from jumping around.
one last thing I have found the Canyon Dance should be snug but really not to tight. hope this helps.
Up front Canyon Dancer and one strap over the passenger section of the seat (with proper protection ).
I do have the wheels "chocked" on the sides with short 2X4 's up front.
If it makes you feel better instead of a strap over the seat slip one (doubled) around the rear tire.
this or the over the seat just stops the rear of bike from jumping around.
one last thing I have found the Canyon Dance should be snug but really not to tight. hope this helps.