Some people complain about the oil filter location on the 4.2L trailblazers, but I think it's a piece-o-cake oil change compared to other vehicles I've owned or maintained. The filter is mounted vertically with a handy plastic drip-deflector clipped to the frame that directs the drippings into your catch pan. The pan drain aims staight down & is real close to the filter so only one pan is needed. The truck is just high enough that even a stout lad like myself can slide right under. No jack or ramps needed.
G/luck
Joel
G/luck
Joel