The ornamental design for an inflatabletowablevehicle, as shown and described.
FIG. 1 is a perspective view showing our new design;
FIG. 2 is a top plan view thereof;
FIG. 3 is a bottom plan view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a right side elevation view thereof; and,
FIG. 7 is a left side elevation view thereof.
The broken lines showing stitching, a bottom portion, valves, straps, and handles of FIGS. 1-7 form no part of the claimed design. The broken lines in the drawing depicting the circular inside surface shown in FIG. 2 are for illustrative purposes only and form no part of the claimed design.