I'm going out on a limb, so to speak, to suggest that there is no way your typical sauropod could support its neck extended far from its body. The resulting torque would crush the proximal-most cervical vertebra. They could raise their head to full vertical extent (perhaps with the aid of auxiliary hearts in the throat to keep the blood rising) and lower it to drink, but only with a big, rolling inverted-"U" bend in the neck. Moving its head horizontally away from the shoulders would have been extremely painful.