Hi Joe and Helen,
Welcome to the Heartland Owners Forum and Family. We have a great bunch of people here with lots of information. They are ready and willing to help when and if needed.
I cannot give you any information about the wall studs, but do "think" they install a backer board in the wall for mounting a tv. Hopefully someone from the factory will jump in here Monday and let you know for sure.
Enjoy the forum and join in some of the Owners rallies when you can.
Jim M