The ornamental design for an inflatabletowablevehicle, as shown and described.
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FIG. 1 is a perspective view of the inflatable towable vehicle showing my new design;
FIG. 2 is a left side elevation view thereof;
FIG. 3 is a right side elevation view thereof;
FIG. 4 is a front elevation view thereof;
FIG. 5 is a rear elevation view thereof;
FIG. 6 is a top plan view thereof; and,
FIG. 7 is a bottom plan view thereof. The broken lines are for environmental purposes only and form no part of the claimed design.