Here are a couple of tech articles on the web, check them out!

http://www.diynetwork.com/diy/ab_exterior/article/0,2021,DIY_13687_4972940,00.html , here is an install on a Scion XB

http://www.truckinweb.com/tech/0201tr_street_beat_customs_sliding_ragtop/index.html , here is an install on a Crew Cab Dually from Truckin' Magazine.