i have to buy a new TV for the new 5.0. I will leave my old one with the 17B trailer(still works great) when i sell it. Is it important to buy an RV TV? and does it need to run on both types of power? i am not getting an inverter thing? but sometimes would like to watch on battery power. I think the one i have is a 19 inch? wouldn't mind a larger one. suggestions?