Earlier I mentioned locking skewers for the wheels and seat. The amazon link I provided was for pinhead locking skewers. Since you're looking for maximum security, I'm going to revise my recommendation to the Pitlock locking skewers. These are about twice as expensive, but are even higher security than the pinhead skewers. The maker of the Pitlock makes 256 unique keys. The Pitlocks are the Hercules of locking skewers.

Check it out: Pitlock locking skewers