Don't speak Canadian in NJ eh? Marrette is named after the company that makes them up there and the founder Wm. Marr The original was a barrel and setscrew design with a insulating cap that screwed on. I have seen a few of them over the years. The current product is a coiled spring screw on, like a regular US wire nut.
Maybe in Canada but mobile homes in the US (AKA HUD models) follow the NEC. If they title them as an RV, then it is the wild wild west with nothing but industry standards and perhaps some CPSC involvement. The NEC stops at the pedestal they plug into.
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