I've done a search, and I know what all *can* be to blame.

I just had 2 (or 4) of the rear links changed out, and it feels a bit better, but the wandering is still there. If I hold the steering wheel, the car will move a foot or two in either direction, without help from wind, crown in the road, etc. It just goes wherever, doesn't matter what speed, but higher ones the effect is more pronounced.

Tires are brand new and properly inflated, and the old ones did the same thing. No excessive or uneven wear, no feathering, etc.

The shop who did the rear links (a good benz only shop) wants to do the steering box next. He feels certain that's the cause of the problem, as he says everything else up front it tight. Anyone else cured their hunting with a new steering box??