Replacing a WFCO 9855, Options?

It depends on what panel the WFCO converter is installed in. My trailer has a Parallax panel, but had an unusual steel insert with a WFCO 9545 installed in it (appeared to be a unusual factory installed combination, the steel insert was not the Parallax converter box repurposed). I used a Progressive 4645 upgrade kit from Best Converter to replace it. If the converter is in a WFCO panel, you only need the converter and not the steel box that comes with the 4600 series upgrade Progressive units. You discard the steel box if installing in a WFCO panel, and use a small plastic clip to retain the front of the converter in the WFCO panel. The instructions detail all of this.

As an alternative, Best sells a Boondocker converter (which is a PowerMax relabeled.) to replace the WFCO.

Charles