The box would accelerate in the same direction (to the right) as the truck as shown by this free-body diagram.
What is a free-body diagram?
A free-body diagram is a graphical illustration which is typically used in the field of science to visualize moments, tension, and applied forces that are acting on an isolated or rigid object (body), while using arrows to point in the direction of these forces.
In this scenario, the box would accelerate in the same direction (to the right) as the truck in accordance with Newton's Second Law of Motion.
As shown in the free-body diagram, the forces that are acting on both the heavy box and truck include the following:
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