inside lights are not steady

Could also be a ground problem....Check all your ground lugs on the grounding bar near the converter.

Typically that is a sign converter is failing.......can't maintain steady voltage

3rd converter in a 2006 vintage MH????
What brand of converters have you been installing?
Who has done the installs?

How are the batteries? Age, condition, water levels?

I've only had lights that varied in intensity, when the converter was failing.