Sounds like you got it right if I understood you. By having a ground screw only on the trailer your relying on a good ground being available through the ball. This is why you sometimes see lights flickering and going out when the tow vehicle goes over bumps. A ground wire from the tow vehicle is best. It sounds like this is what you did by connecting the white wire out of the van to the trailer wiring. If you screw up the powers and ground you'll blow fuses so I'm thinking you're ok.
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