Hi, I'm new to the forum. I received my Expy a few months ago. I found the site trying to solve a problem with the air suspension. I know now that the air compressor dryer burst. So i am switching over to the coils, mostly cause I would like to lift it eventually. I am looking at the strut-master conversion kit, are they hard to install? My skill level is doing brakes and changing an alternator and changing the oil on a Ford Taurus. Another question I have to do all 4 wheels, correct?