Got a new RV power cable, and everything is working. Going to replace the shore too, it got heat transfer.
It was a combination of using heavy loads, and resistance on the cable. Its even been raining all the time. I used my multimeter to eliminate everything down to the socket. Rain could have gotten into the socket, or damage to the socket let moisture in.
With the new cord 123v is turning into 118v at the socket, Which might be normal. I’m making sure it doesn’t heat up, and replacing the socket when it arrives.
Its not my computer, i’m typing on it right now. It might have contributed to the heavy loads though. Selfish as it may seem, I’m happy its not my computer.