Thanks for the info Ramlight.
Well, I finally got the lift installed and I couldn't be happier with the way it turned out!!!
I didn't want to drill any holes in the vehicle, so I ended up installing a 1/4" aircraft grade aluminum plate and bolted it down using the existing tie down bolt holes in the cargo floor. I installed 3/8" bolts up through the aluminum plate and bolted the lift to the plate with the rubber cargo mat in between them.
As the pics show, I used washers to build the plate up to the carpet height because when I bolted it down without them the plate sunk down too far down into the padding and carpet.
I also had to cut the main vertical steel post of the lift to lower it enough for the boom section to swing in and out without hitting the top of the cargo opening.
I ended up using the positive terminal under the rear seat for power and one of the rear seat studs for a ground and it worked out perfect! (Thanks Roadie)
I lost the use of the cargo floor storage area, but it was a small price to pay to make it easier on my back and now my daughter can take my wife out anytime they want to go somewhere and she can put the scooter in and out of the Trailblazer with ease.
Thanks to everyone for all the help. I really appreciate it! Now on to the pics!!!