Not quite as heavy of construction or cast aluminum housings as the 7 pin round ones on semi tractor trailers.

But these are metal construction both male and female plus mounting bracket and rubber boots.

https://www.delcity.net/store/7!Way-Mobile-Home-Connectors/p_8657.h_83231

https://www.amazon.com/Tow-Ready-118031-Trailer-Connector/dp/B003UDKTH8

https://www.amazon.com/Tow-Ready-118030-Metal-Connector/dp/B001GK9FKO

https://www.amazon.com/CURT-58190-7-Way-Blade-Connector/dp/B001GN6QLM