Your 6-50 receptacle is (2) 115 volt legs and a grund which is more suitable for a 230 volt appliance like a welder or air compressor.
Your coach has (2) hot legs, a ground for safety and a neutral. The neutral allows for (2) separate 115 volt circuits to power everything in the coach. Without a neutral, the coach appliances won't work. It is NOT safe to use a hot and ground to provide 115 volts. And yes you could damage the coach and worse, hurt someone.
2019 Horizon 42Q
Cummins L-9 450 HP
Maxum Chassis / IFS with Tag