Seems to me that there are a number of issues in this thread. Some are vibrations at highway speed, but the initial post talked of a "vibration" in the pedal and steering wheel when accelerating. So let me explain what I'm experiencing and please let me know if this is the same as other posts.
Under normal acceleration from a dead stop, I'm experiencing a shudder in the gas pedal and steering wheel for the first few seconds until the vehicle starts to pick up speed and stops before or around when it shifts into second gear. Other people have referred to it as a wiggle, a wobble, or slight right and left torque steer. This appears to be unrelated to tire balancing or wheels etc and may have something to do with the power shifting to all wheels (on the 4wd version) when first starting off.
Is this what others are experiencing, and if so, have you had the issue resolved?