Bad Piggies Rise and Swine Bonus Level 2-V (2-5) can be 3-starred using a single contraption. Use an L-shaped vehicle with grappling hooks in the top-right and bottom-left corners. Swing your way rightward, being as careful to avoid the TNT below and not using both grappling hooks simultaneously. Either one will undoubtedly Krak-Snap your contraption.
If you have a different strategy for completing this level feel free to leave a comment below.