It is a normal characteristic of Mercedes built automobiles to pull with the crown of the road. The solution is to increase camber by one degree on the right side. Typically 9.6 to 10.6 degrees. Mercedes allows up to 2 degrees more caster to correct pulling.
It's just the opposite on right hand drive cars. Rear toe also plays into this. Hope that info is helpful.

There should be an adjustment screw on the top of the steering box above the Pitman shaft. It is adjusted be turning down to fully compress the spring and then backed off approximately 3-4mm measured at the circumference of the adjusting screw. This adjusts the worm gear bearings and must be adjusted with the wheel in the straight ahead position.