The ornamental design for an inflatabletowablevehicle, as shown and described.
FIG. 1 is a perspective view of the inflatable towable vehicle showing my
new design;FIG. 2 is a top plan view thereof; FIG. 3 is a right side
elevational view thereof, the left side elevational view being identical
thereto; FIG. 4 is a bottom plan view thereof; and, FIG. 5 is a front
elevational view thereof, the rear elevational view being identical
thereto.