Hard wired shore power to smart plug
For awhile I've wanted to switch the shore power from hard wired to a detachable cord. After some looking I decided the smart plug was the best way to go.
The next issue was going from a round hole with three bolts to a square plug. I bought a sheet of 1/4 inch marine starboard (hdpe) so basically a plastic sheet. Took out the current "mousehole" and used that as my starting template. Then i cut a square hole for the smart plug to fit through. Leaving a little air gap. Mounted the plug to the adaptor plate with some stainless bolts and was ready to cut the cord. Install on the trailer was relatively easy. Did a quick test pulled it off and put some silicone on the back and around it to seal it all up again. Very happy with how it all turned out.