I've used these: https://www.amazon.com/CNLINKO-Industrial-Connector-Receptacles-Waterproof/dp/B06XFMQHWM
They are not 'standard', but if you're using all your own equipment you're good.
1/4 turn twist lock, 20 amp rating, and you can get with various terminal counts. (I'm using a 4-pin to...