As this is a mostly UK based forum you will find a lack of discussion on stadium trucks in general. The X-60 is a great truck that tends to work well on most styles of track, loose dirt to high traction blue groove. There are a good selection of setups on petit rc:
http://www.petitrc.com/setup/xfactor...actoryX60.html
Clayton Easley's setup on dirt is magic and I haven't felt the need to go away from it in any great detail no matter the track I go to.
Stadium truck is holing its own in the pacific northwest of the US and has been one of our largest classes in our Washington/ Idaho NCT serries.