The GVM is 1500kg so I'd say about a ton. To operate the electric brakes you need to have a electronic brake controller fitted to your car, they are about $300 and can be found at any place that fits towbars. They work on sending an impulse to the brakes on the trailer when you apply the brakes on the tow vehicle. You can set the sensitivity and delay with the controller. Most controller also have a manuel brake button also that allows you to apply the trailer brakes to stop those fatal swerves that they do sometimes.