thanks for the response navigator. i'm rotating every other oil change, or roughly every 7-8k miles, since day one. that's what my local dealer recommended.

i also thought it odd that only the front two were showing wear. it was weird too, that they all seemed fine through the summer. but i do travel a lot and i guess having all that extra weight can rough up the alignment. i've put 20k on it since last december.

if they don't find anything next week, i guess i'll just have to keep a close watch.