I claim the ornamental design for a loading ramp, as shown and described.
FIG. 1 is a perspective front, top and right side view of a loading ramp showing my new design;
FIG. 2 is a right side elevational view of the loading ramp shown in FIG. 1;
FIG. 3 is a left side elevational view of the loading ramp shown in FIG. 1;
FIG. 4 is a top plan view of the loading ramp shown in FIG. 1;
FIG. 5 is a front elevational view of the loading ramp shown in FIG. 1;
FIG. 6 is a rear elevational view of the loading ramp shown in FIG. 1;
FIG. 7 is a bottom plan view of the loading ramp shown in FIG. 1; and,
FIG. 8 is a perspective front, top and right side view of the loading ramp shown in FIG. 1, with a tail plate of the loading ramp shown in a raised position.
The broken lines depict portions of a loading ramp which form no part of the claimed design.