OP didn't mention what brand of converter has failed, but most times the converter is contained in the lower portion of the power distribution panel (both 12 VDC and 120 VAC). If that is the case in your RV, you can replace just the converter section without any major wiring at all.
This happens to be the model in my RV; very similar to many in recent years.
Just as an example:
https://www.amazon.com/PowerMax-PM4-.../dp/B01ER3LJSM
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