Sorry, makes no sense. If 50 amp generator (never heard of them being rated in amps) why not just leave the generator in place and replace:
Shore power cord
Wiring from shore power cord to ATS (assume you have an ATS-- if not to a new outlet that generator can be plugged into)
New wiring from ATS to main 120 VAC breaker box
New breaker box with 240 VAC/two HOTS inputs.
This AIN'T for the faint of heart or on a small budget. There are other options, but this would be the "automatic way"-- the way a 50 amp coach would have been wired from the factory.
