Welcome aboard! Guitars and metal, huh? I think you and I might have something in common!
Anyhoo, unfortunatly, most trucks are made for .37 in mind, since that's what most leagues run on. I believe there is a way to convert them with some serious .truck file editing, but there are many people better versed in RoR files than I am.
Enjoy your stay!
(Beat ya to it, Tom P.)