30 to 50 amp. Problem adapter/converter melting and failing

Check all your connections etc. Make sure everything is tight.

And cut back your power consumption. If you need the amount of heat from 2 electric heaters, you will have to use propane in place of one of them. But I can't fathom why you would need that much heat unless someone is living in the RV.

Aside from the heaters, your converter may be a heavy draw if your batteries are down.