We claim the ornamental design for a support platform, as shown and described herein.
FIG. 1 is a top right rear perspective view of a support platform in an open position and illustrated as being inserted into a rear seat of a vehicle with front legs extended and supported by a floor of the vehicle,
FIG. 2 is a bottom rear perspective view of the support platform of FIG. 1 in the open position illustrating the front legs extended,
FIG. 3 is a perspective end view of the support platform of FIG. 1 in a closed position,
FIG. 4 is a bottom view of the support platform of FIG. 1 in the open position illustrating the front legs retracted,
FIG. 5 is a top view of the support platform of FIG. 1 in the open position,
FIG. 6 is a left side view of the support platform of FIG. 1 in the open position,
FIG. 7 is a right side view of the support platform of FIG. 1 in the open position,
FIG. 8 is a front side view of the support platform of FIG. 1 in the open position; and,
FIG. 9 is a rear side view of the support platform of FIG. 1 in the open position.
In the drawings, the broken lines in Figs. depict a vehicle and portions of the support platform that form no part of the claimed design.