Did you get an answer on the SCM yet? If not, if you can read an SCM, you can look at the boards and do a signal trace...test for AC noise at the end of the rectifier, then look for the voltage regulating mechanism. is it sealed, monotithic or component? if component, Im pretty sure you can find every single item online today via digikey, acme or parts express.
Does the sunline converter isolate the coach 12v from the battery when plugged in? if so, you can likely hardwire a smart charger.
I rewired/cleaned up my 2461 2 weeks ago when I got it home and I note the charge line from the tow vehicle is just fused 20A and has no VR system at all.
now that I think of it, Id like to see an SCM as well...