If you have too much toe-in and some tires with grip you WILL draw the front end DOWN while moving forward. I didn't believe it until I saw it on my son's Barracuda.
Some Mercedes Benz cars have over 10* of caster. On those cars, just a small adjustment of toe will throw the camber out several degrees, because the caster is at such a steep angle. If you've ever seen a Mercedes parked with the wheels cut, you know what I'm talking about. The wheel looks like it's going to fall off. Toe adjustment will affect camber on anything whose spindle is not at zero with caster and SAI. That's just how front end geometry works.
