I'm pretty sure that 2004 Country Coach conversions were the beginning of the L-series. That means your Country Coach serial number begins with L. A friend of our has an 04 and their CC serial number is something like L003. Look on the A pillar driver's side. Here is a picture of ours (#L030-2006). We are the 30th L-series conversion. 2006 model built on a 2005 Prevost shell.
CC#.jpg
The L-series all had Crestron control systems I've been told. L-series models are well thought of.