Another problem with arrestor gear is that it does a real number on AHRS (Compass) systems with all that iron just at the runway end. Remnant sets are causing ATC problems at Chicago O'Hare - AHRS equiped aircraft don't follow the same heading as ones with IRS.
We had a similar problem on the end of our company runway (left over from F-104 production) - measured over 6 degrees variation in Mag Heading as you moved towards the gear.