At Carowinds on a weekday it shouldn't be terribly crowded, but I have found personally that Hurler is best in the front or near the front, while Thunder Road forewards seems to be best near the back. The longest line will be for Borg Assimilator and I reccommend you hit it right at opening or right at closing (I have always had close to walk-ons on most of my visits right at closing.