The ornamental design for a loading and unloading apparatus for truck beds, as shown and described.
FIG. 1 is a front perspective view of a loading and unloading apparatus for truck beds, showing our new design;
FIG. 2 is front view thereof;
FIG. 3 is rear view thereof;
FIG. 4 is right side view thereof where the left side view is a mirror image;
FIG. 5 is top view thereof;
FIG. 6 is bottom view thereof; and,
FIG. 7 is front perspective view thereof; showing the article in a state of use.
The broken lines illustrating a truck bed in FIG. 7 represent environmental subject matter that forms no part of the claim. All other broken lines illustrate portions of the loading and unloading apparatus for truck beds that form no part of the claimed design.