Hi. First time poster here with (probably) naive questions for you all. I grew up a Mack-crazy kid in the 70s. My Dad's company had a fancy new Superliner in 1977 with a 36" sleeper, custom paint stripes and aluminum wheels all around. That was the first semi I was ever exposed to and I used to go for day-long rides in it as a young kid (either that or in the Western F model we had) and that truck made quite an impression on me. I was hooked. I even used to write to all the truck manufacturers back then asking for literature. All of them responded but the president of Mack, Mr. Curcio, personally sent me all kinds of Mack history books, bulldog ash trays and watch fobs, Mack literature and Mack lithograph packages of historic trucks. Needless to say, I was in 7th heaven and I still think it was a pretty neat thing for him to do for a kid. However, as I grew older I kinda drifted away from my interest in Mack trucks and took more of an interest in Petes and KWs. Years later I even got to drive a Pete for a few years at work. Anyway, lately I've kinda been checking out Macks again and I have some questions that might be basic but I couldn't find the answers in browsing through the old posts here. And most of my old Mack literature is either too old or doesn't go into the level of detail I need. Here are some questions about my first favorite truck, the Superliner: **Can someone elaborate on the difference between Superliners I vs II? What year did the change happen? What were all the changes/improvements (besides square headlights)? **Were there different interior trim levels available? What were they and how did they differ? **What do the various RW model numbers mean? Say an RW613 vs and RW7**? Were there other number combinations? RW8**?? I presume the bigger the number, the heavier the spec, right? **I've heard of some Superliners referred to as "big frame". Is this the RW7***? Or what is this referring to? One of the things that always bugged me about Superliners was that the frame rails always looked so thin (in profile) compared to other OTR trucks. I've seen a couple with what appear to be beefier frame rails. Are these the big frame models? What years were the big frames available. **I've seen some Superliner tractors set up with floaters on the front. Was there a 20,000lb. frt. axle option? How heavy could you spec a Superliner (for a heavy haul lowboy setup, for example)? Finally, I'd love to get my hands on some nice, big Superliner digital pics. I've grabbed several small ones from this site and Hank's already but it seems like nice looking Superliners are tough to find (at least in my opinion). I see a really cool red one on the BMT banner at the top of the page (although you can only see part of the truck). Does anyone have the whole, full-resolution photo? I'd love to see it. Are you listening in, admin? Sorry for the newbie questions. I enjoy the site. Thanks.