If I can't what can I do to make the electric wiring and system a improvementof what it is now. It's a 1978 Toyota motor home(the 20 Amp is for the ac and the 15 is for the outlets).
You can add another breaker, but you’ll need to pull more wires.
You will probably need to rewire from the box through the shore power plug. You will need to up that part to 50 amps
Sure if you know what you are doing.