Go to Walmart and get either a 50 to 30 amp adapter and a 30 to 15 amp or if your coach is 30 amp then just get a 30 to 15 amp adapter. I carry a 30 to 15 amp adapter all the time for my 30 amp coach. Had both with my last coach.
2017 Grand Design Reflection 303 RLS
2004 Ford F350 Lariat 4x4 Dually