Hi righttime,
Welcome to the Heartland Owners Forum and Family. We have a great bunch of people here with lots of information and all willing to share their knowledge if needed.
I think they have eliminated all the low point drains, but not sure. A lot of folks are using air to blow out the lines or using the pump to put antifreeze in. But someone with more knowledge than me will be on and let you know for sure.
Meanwhile, enjoy the forum.
Jim M