Unsupported NM-B wire, too close to ground, and no interrupter on receptacle = no insurance settlement when MH and house burn to the ground.
The OP was lucky his wife was in the area to put the fire out but what would have happened if she became a part of that short circuit with a water hose? Worse yet, what if she was in the house napping, when the house was ablaze?
Folks need to think these electrical matters out carefully before proceeding. I really don't care if it's permitted, inspected, or not but any Fire Marshall or insurance company will. Also, if you sell or refinance your house, most home inspectors would have caught that RV receptacle as non-code. You would be removing it or replacing with the proper installation to proceed with a sale or refinance.