[rames14]

First, your inverter changes 12v to 120v. Your leveling system works on 12v. So if neither are working, that sounds like no battery. Your battery shut off in the convenience bay “does not” cut power to the level up. So, you either have dead batteries or a wiring issue. My guess is dead batteries. As Robert said, start with the easy check. Use a multimeter and check your battery voltage. Once you know you have good batteries we can help from there.