Wiggle... or vibration. Wiggles are most commonly caused by caster being improperly set, next... and most likley (if in the Steering) would be Ball joints. if the Carrier bearing may cause some harmonic vibes. this can some times be diagnosed by adding a small shim in the Rubber that holds the bearing, mind you this is not a fix.... this will either amplifiy or remove the symptom. Hope this helps.... also just noticed you have a 4X2... check your tie rod ends for exessive play.