First off welcome to irv2 Jon.
This LINK may
answer some of your question on your Batteries and how they are charged than it gets into inverters which you may have also.
There other links to systems on your coach also.
Being a 06 coach as long as the batteries were properly maintained they should still be in good shape. If they are AGM's sealed all for the better.
Some coach's have systems that will keep all batteries fully charged as long as its plug into service.
will explain your coach link is found in sticky above in this forum.
We have irv2 groups through out the country that are free for joining you just have to contact the one in your area, you will meet people in your area that you can trade conversation about your coach. These area's are at bottom of main forums.
People on this forum can help with your Fleetwood product.
Don't get to overwhelmed things will fall in place enjoy the forums and do post often.