]Welcome to the site Joe. Sounds like you've done some reading already! And as the Roadie told you, no one uses TrailVoy anymore, if you are curious why, you can read the whole story here:
http://gmtnation.com/f5/welcome-gmtnati ... story-226/Also sounds like you have some plans laid out for your rig already. Since you mentioned you have a non G80 rear end, I'm curious if you know what gears you have. If you've got 3.42's you might want to consider adding a transmission cooler to your setup.
Also, you're going to need either wheel spacers or adapters (depends on what rims you run) to clear the upper ball joint when you go to 32's. Two useful threads to answer questions in regard to this:
Maximum Trailblazer Tire Size without Modification &
Wheel SpacersAnd welcome again.

Once lifted 03 Trailblazer on 35's, gave it up to travel the USA with my family.