What must you be prepared for when driving a partly loaded tank truck?

You answered correctly. When driving a partly loaded tank truck, you must be especially careful because there is a high risk of tipping over in curves and a great danger of skidding. This is due to the movement of liquid inside the tank, which can strongly shift the vehicle’s center of gravity and affect stability, especially when turning or making sudden maneuvers. Driving down slopes, however, does not typically make the steering unusually heavy with this type of load, so that third answer is not correct. In similar questions, always remember the special risks connected to liquid loads in tank vehicles: tipping and skidding are the main concerns because of the shifting weight.