In your situation, I would remove the two(2) rear tires/wheels and lay the two(2) tires/wheels "face down" (to protect the outer-side of wheel) and then lower each of the VX's rear brake drum into the backside of each wheel bowl.
Thus, the entire rear end of the VX would be resting on the horizontal tires/wheels. They can't steal the VX, because it won't roll. They can't steal the tires/wheels, because the VX's rear-end is sitting on them like a stack of books.
Make sure your VX in "nose-in" in the parking spot, with the "rear-end" facing towards the street (with horizontal tires exposed for view). So when any crooks go scouting around town for easy finds, they'll see your VX is too much trouble to mess with and move on to easier pickins'.
Problem solved. Enjoy your vacation with total peace of mind.