Snap-on tread for boat or recreational vehicle ladder

The said Industrial Design consists of the visual features of the Snap-on Step Tread for Boat or Recreational Vehicle Ladder shown in the hereto annexed figures, whether those features are features of one of shape, ornament, pattern or configuration or a combination of any of such features.Portions of the figures shown in broken lines are for the purposes of illustration only and do not form part of the design.Figure 1 is an exploded perspective view showing a first variant of a snap-on step tread for a boat or recreational vehicle ladder;Figure 2 is a perspective view, taken opposite that of Figure 1, showing the first variant snap-on step tread;Figure 3 is a side elevational view showing the first variant snap-on step tread;Figure 4 is a side elevational view, taken opposite that of Figure 3, showing the first variant snap-on step tread;Figure 5 is a top elevational view showing the first variant snap-on step tread;Figure 6 is a bottom elevational view showing the first variant snap-on step tread;Figure 7 is a perspective view showing a second variant snap-on step tread for a boat or recreational vehicle ladder;Figure 8 is a side elevational view showing the second variant snap-on step tread;Figure 9 is a side elevational view, taken opposite that of Figure 8, showing the second variant snap-on step tread;Figure 10 is a top elevational view showing the second variant snap-on step tread; andFigure 11 is a bottom elevational view showing the second variant snap-on step tread.Figures showing the design are included.