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Or it could be that there is a problem in the plug at the tow bar. If the male pins on that plug are split, they can be gently eased a little wider. That often helps make a good connection from...

I don't think the removing of the electric brake controller is the cause of your problem, the electric brakes use a separate wire to the brake lights through the trailer plug.

If your van lights...

Looks like the sag on a typically driven GU.
They all seem to do that after a while on the drivers side, especially if it was only ever driven around with one person in it.
Nothin major that a set...