Converting a class C from 30 amp to 50 amp service

There is more than just some wire switching to 50 amp. First 50 amp is actually two 50 amp circuits. Giving a total of 100 amps.
To switch over to true 50 amp you would need a 50 amp cord, transfer switch, wiring and breaker box. There are other ways to use one leg of a 50 amp circuit. But so many potential safety issues that I would not attempt it on the forum.
I would try some of the suggestion above before attempting a upgrade.
Here is a link to a PDF document on 120 volt 30 and 50 amp wiring.