What are the best house batteries to buy today?
You will get a variety of opinions on this topic. Your coach is a later model than mine, so I don't know what Foretravel installed. They always used top quality batteries so you can't go wrong by installing the original. Someone may have already put something else in, so you would need to contact the factory. Most likely a sealed gel or AGM maintenance free battery. Very important that the inverter/charger and engine alternator is set correctly for long battery life.
I recommend that you go to the profile section of the forum and fill in the blanks so everyone else will know what year and model coach you have for future posts and the info gets added to the post without you having to do anything.
Welcome to the forum.
As Jerry W. said, there are many opinions out there. I do know, however, that the Foretravel factory discontinued installing Lifeline AGM's in their new coaches. They have returned to installing 8D gels (I think MK/Dekka). I don't know the specific reasons.