Electrical issues in attitude toyhauler

Hello, I'm new to this website but hoping I can get some help. I have a 19' 2006 attitude toyhauler. I am having issues with the electrical. It started when I went camping at a motorcycle park. I had to plug into a 15a gfi outlet. It instantly tripped the gfi. Went on the web and found something that said unplug the nuetrals one at a time. I found the problem I thought. When I got home I plugged in and went to check my generator and there was a loud buzzing noise. I flip the breaker off on the generator and the buzzing stopped. I found the junction box where the power comes in and then goes to another junction box that I think goes to the generator. I unplug the wires and then shortly after I went to plug them back in and the black had power and the neutral also had power and the neutral arched badly when being connected. I also checked in the breaker box where all the neutrals and grounds are connected and it shows that I have 120 V between the ground and the neutral busbar.it seems that the power to the inverter is not coming from the breaker it's coming from the white neutral that's connected but if I shut the breaker off for the converter it kills the converter. Hopefully this is making sense to somebody that can help me with this issue thank you.