Podivin-
It seems to me that the combined "power centers" were popular when your coach was built. In a power center, the converter was underneath the AC ad DC distribution panels.
See this link for both pictures and an upgrade path to a modern converter that fits in the same place in the power center.
I did perform that upgrade on my former coach. It was an easy upgrade.
On that coach the transfer switch was bolted to the
back of the power center. So it was near the converter, but not part of it.
By the way, I've always been satisfied with the folks at
Bestconverter.com. Randy answered many of my questions, with patience.