Hi-lifts by themselves don't seem to do a whole lot of good on a Vx. You can get some heavy steel (2x2 x length x 1/4 or better wall thickness) to put in your trailer hitch to extend it far enough out that a Hi-lift can be used. or if your slider bars stick out wide enough you can use them.
Like Loco said,, If you're just changing a tire, your stock jack can change a 33" no prob.