I'm thinking about getting into a big truck. Something like an Astro or Titan (if one could be found), GMC 9500, something along these lines. It would have a Detroit Diesel for sure. I've never driven anything bigger than a C65 and I don't have a CDL. First, what do I need to do to become legal to drive one, and second, where can I look to find one? Any help would be greatly appreciated.