Good luck w/the procedure Red....... And a speedy recovery.
That 12V site is extremely helpful for getting a grip on battery consumption.
We too have a LP line running to where the grill mounts onto the side of our RV.
We don't use it either. We are big charcoal fans. Cindy bought a little grill for $20 a few years back and it's still doing very well.
The 12V/6V issue is one that remains in the hands of the user.
Since the RV world is very 12V friendly, two 12V batteries can sometimes be a better Alternative. But I've heard alot of good things about doubling up 6Vs.
Good luck Red !!!
My Other House Is A '02 Jayco 31FKS Designer TT