all the rear windows of these vans are really easy to get in and out. getting the butyl tape off is another story.
basically remove snap in trim piece's around windows and remove the nuts that hold window and frame in place. I usually used a large screwdriver and found a place to start prying window frame away from door/body. leave one tool where I started and work my way around till its free. be careful or have another set of hands ready to grab window so it doenst hit the ground once its free from the goo. definitely easier in the cold vs when its warm out and a lot less messy. stuff stings like gum when its hot out and that stuff makes a mess if you get it on stuff.
I didn't reseal with butyl tape though. I had half a tube of silicone bathroom sealer that was getting old that I used instead. going on 4 years and no leaks yet.
"understeer is when you hit the wall with the front of your car, oversteer is when you hit the wall with the rear of your car, horsepower is how hard your car hits the wall, and torque is how far your car moves the wall."