If you already have a nice AC and DC Power Distribution Panel you dont really need to replace that. The converter/charger is usually a separate module or chassis located in the bottom of the Distribution Panel chassis. You can just replace the module/chassis only.
Let Randy at BEST CONVERTERs know what you want to do and he can help you get setup. Just don't let him sell you a WFCO unit haha...
I actually left my WFCO converter/charger in place and mounted my PD9260C 60AMP replacement converter/charger unit in a different location closer to my battery battery bank. Since my WF-8945 converter/chassis was new this gives a backup to use if I need it. I just flip the 120VAC circuit breaker ON-OFF for the one I want to use... I could never get my WF-8945 to go into smart charging modes so got a converter/charger that would immediately go to those modes using a remote control if I needed it to do so.
Post what make and model you have that needs replaced - Lots of info on how to replace it can be found on google as well... Converter/charger units only need the 120VAC connection and two DC 12V cable connections... Thats it.... Some converters have built-in smart mode controls and some or remoted. My PD-9260C has the remote control type up inside the trailer where I can force the converter into any of its smart charging modes with the push of a button...
Just my thoughts
Roy Ken