There is a possibility that the problem is not yours. Years ago we had an issue at the sticks ‘n’ bricks. Walked in, hit the light switch and the bulb blew with a loud pop. Got out the volt meter an quickly determined there was 220 volts on the ceiling fixture. Turned out there had been a lightning strike on the line up by the road that had blown one of the power company’s fuses on their neutral. So check all over your system including at the pole feeding your rig. And absolutely do not plug in or turn on anything until the fault is found and fixed.