Not really. Unless you mean the basic concept. Seaward made (makes) fine panels....and he advises, if your boat has an ammeter on the panel, it be replaced by a voltmeter which he can supply; one of the reasons is that the ammeters were wired poorly.
Yes. Why? Because of the trailer pin connections. That's why. Had nothing to do with wiring at the panel but WAS because of the connectors. This night be something new to some here, but not to most of us.s...and that wiring will eventually fail.