To me that looks like the "RV Standard" plug unless I missed something.
One good thing about it is the automobile and truck industry for the most part use the RV standard on the TV end of it.
Or at least on my Jeep and Silverado
I've bought two 7 pin pig tails, a Hopkins at Wally world and an 8 foot Bargman I ordered on line and they both used the RV standard that seems to designate 3 different size wires for different things.
Or at least Jeeps and Silverado trucks
My original was a Bargman, all 3 cables followed the same color scheme a wire gauge.
10 gauge for battery
12 gauge for the brake line.
14 gauge for all the lights