The Trailblazer is pretty easy although mine might be missing a skid plate that the previous owner never put back on, the car sets a good amount off the ground the drain plug is on the bottom of the pan in the open, and to get the filter off if it's loose enough just reach up and undo it by hand or if it's a little tight a cap wrench and extension makes it super easy to get off, I alway remove the filter first since the sump holds 7 quarts and I don't want to splash the filter into a pan filled with all that oil.^^^^^^^^^
Adding on to my last post: This isn't my vehicle. It belongs to my 23-year-old niece (duh...Jeep Wrangler) and I'm making sure it is taken care of. No charge to her.
I'm not a fan of Chrysler, but I do have to say this is the easiest oil change out there. I don't have to use ramps and the cartridge filter is on top of the engine. Simply remove the top of the filter housing, remove and replace the long cartridge, change out the rubber ring gasket on the housing and screw back in. Drain, fill, done. 3 pumps on the accelerator to reset the OLM and you are good to go.
I last changed her oil on Apr 5th of last year. She had almost 61,000 miles, so she added about 7500 and there was 8% left on the OLM.