Hope somebody can advice me how to resolve this. I ride a F650GS Twin on factory standard shocks with a pair of Hepco & Becker Xplorer Panniers 30/40L. When I ride without the panniers, I can ride up above 160kmh without any issues. With the Panniers fitted and loaded, preload cranked to the max, riding anything above 130kmh and the handlebar shakes wildly. I had to reduce my speed to regain control. I am guessing that it might be a rear shock issue - not being able to handle the load. (I'm about 68kg fully geared and the panniers with load is about 30kg total) Would changing my shocks solve the issue?