The 1200 GS has an incredible soft front end.

As a test you can:
1) Attach a rope from LHS handlebar to ground
2) Attach a rope from RHS handlebar to ground
3) Tighten one of the ropes (bike will lean to one side)
4) Take a look at fork / steering
5) Have a valium

The four first steps can easily be done in a van or trailer.

I’m not saying that this causes the wobble... It’s smart to check all your bearings (steering, wheel, paralever front, paralever rear, wheels) and check all major bolts and the suspension.

I found out it was all becuse of tyres presser, was very low on both and i was heavy loaded.

Now i am checking the tyres presser every stop.

From the 2008 the 1200 GSA come with tyres presser warning.

You lucky .. keep on raiding.

Must be the bike - tire combo.
My 1150 with TKC´s handles fine, but then again when I ride two up, I rarely go faster than 130kmh (80mph?)
Without luggage I had it up to 180kms/h a few times (short while), no problem, but not realy the kind of speed you should be doing on these tires.

Johan