What happens if you plug a 50 Amp RV into 22V welder plug

The issue was created due to a missing neutral which balances the voltage and acts as the return path for the split phase imbalanced load current.

The ground wire is required for safety and signal integrity. Bonding is required, but under certain circumstances multiple ground rod connections are allowed, however a single point ground eliminates circulating currents and noise issues.

If you have any questions, you should consult with the NEC and local building/housing authority.