For less than $10 you can buy an outlet tester to plug into your house's outlet. That will tell you if the plug is wired right. Another $20 will get you a meter to measure the voltages on the plug for good measure. What happens if you plug a lamp or hair dryer into that outlet?
Not clear to me if the breaker box with the fried wires was in your stick house or the RV.
2017 Coachmen Leprechaun 319MB towing a 2013 CR-V AWD away from San Diego