My brother recently bought a 2020 1290SAS and discovered a nasty high speed wobble / head shake at around 125 / 130 mph (on private roads of course). An attempt to ride through it became dangerous. A change of tyres, tyre pressures, removal of screen, hand guards and anything else that might effect stability was tried to no avail. This was without any luggage. The dealership was not interested. A subsequent google search showed his experience as far from unique. The bike is now sold. I thought his experience worth sharing.