Most CC Magna rigs came with Group 8D 12v Storage batteries. You probably have 4 of them at about 225 amp hours each or 900 amp hrs of storage. You need to have more big batteries to run your power drapes and the residential refrigerator.
Their life should be very good with the proper care. But they are at least 6 years old and could be worn out?
The previous rig probably had golf cart batteries which are also very good but would require 8 of them to equal the 12v bank you have now.
If the alternator is not charging the house battery then check the battery connections. Take them apart, clean them and tighten them down good. That may fix your problem(s).
Your rig might make it a couple of nights with the refrigerator on and other systems working but would likely exhaust the house battery in less than a week.
When Boondocking with a friend who has a 2007 Affinity, he needed 3 or 4 hours of generator time a day to recharge his rig.
Thus you would need to charge the batteries with the generator for about 8 - 10 hours to get a 90% charge back into them. They are dead flat.
Have you checked the house battery voltage with the generator running to see if a charge is being applied.