Eric, this is a poor answer but a response anyway. I owned a 2003 Gulfstream 5230 new. They quit making them for several years, then fired back up recently. I saw one at the Dallas RV show last month. It was a 2016 2350 and it was identical to my old one in every detail I remembered. Same layout, feel, etc. Just 13 years newer and a little nicer finish with a few more bells and whistles. If you go this site you can see the specs on the 2016 and get some idea of what you might have on a 2002. I think the 2002 and 2003 were spot on the same. I came home, looked at some old pictures of ours and it was just as I remembered and just like the pics I took of the new rig in Dallas.
http://gulfstreamrvtrailers.com/canyon_trail_xlt/specs.php
Now, that's not a complete answer by far to your post but it might give you some idea. Incidentally, back then you could get them on a Ford 350 or 450 and I had the 450 just like the new one. It was one of the most fun and enjoyable rigs we ever owned and only some family health issues caused us to sell it and be out of rving for a period of time. We loved the layout and the bath and the kitchen especially.
Paul