Ok I maybe wrong but I believe that the toe out is to cause one wheel to pull against the other keeping the vehicle in line which may not be noticable at low speed and you wouldn't really notice it while going over bumps, but if you had street tires on and was traveling down a road you would notice the quad would probable drift to one side or another.
So ARRNB you know how to adjust them, to find the toe out you need to mark the center of the wheels on the tread, jack the front end up, point the wheel straight ahead, then measure the distance from center of the front of the wheels and then measure the other side (the back). Take the first measurement minus the second then rotate the tires 180 degrees and do it again. Take the adverage of the two measurement (the first measurment should be larger) and the toe out for the quad should be between 0.79 inches and 1.97 inches (20-50mm)
If you measure it once and then rotate the tires and measure again and find a large difference between the two, you may have something bent, a bad rim, or something else that causes the tire to slightly wobble.
But if it was me I would do it by eye, and have them go straight to slightly out because you probably will never be going straight down a hard road, with no bumbs at high speeds. Or if you were racing it may be more of an issue. But like my wife always tells me I could be and probably am wrong on this whole thing. Hope I could help