I think if you want four seats in a Class A, it will be a custom installation.
Our 96 Southwind has a seat behind the front passenger seat. It swivels and will turn to the front.
If I wanted a forth seat, I would have to remove the couch. Losing the couch would not be acceptable to me.
Most Class A units are designed for two people. So, you will probably be looking at some custom work and probably losing something.
Only you can decide if it's worth the trade.
But, I think it is a neat idea. The kids could see the country while traveling rather than staring at phones or computer screens.
I hope you find what you need. Enjoy your travels.
