Mc,

You didn't indicate how your Brick is telling you it's out of alignment? If it's pulling to the left or right it may be a tire problem not the alignment. A tire with a radial pull on the rear won't be noticed untill rotated to the front where it will cause a pull. A quick way to check if it's a radial pull or not is to swap positions of the front right and left tires/wheels ... if your Brick still pulls but in the other direction it's one of those front tires, not the alignment. This would explain why rotating your tires may cause your Brick to suddenly start pulling and seem out of alignment. Hope this is helpful.