In those pre 2007 years, Phoenix did a lot of undocumented activity, so I suppose it is possible to have a 2004-2900.
One thing to keep in-mind about PCs made 2004 and earlier. 2004 was a significant transition year. The earlier 2004's were built like previous model years, without the integrated spare tire rear wall system nor the current day entry door. So if shopping for an older PC, a later-made 2004 would be a better choice. They are easy to spot in pictures.
A similar point concerns the whole house inverter and two batteries. 2007 was the first year to have that feature as standard. I understand it is a rare find in a 2006.
Back in early 2007 when we were contemplating a PC, we initially considered ordering one stripped like we had with the motorhome it replaced, without many basic features like the convenience package and whole house inverter. This was to get the price down to what we wanted to spend. But as it went, we decided to splurge and get everything we desired, a decision we never regreted.
My point in sharing this is there are a rare few PCs out there being sold with missing standard features. So when internet shopping, pay attention to the description and pictures.
