If you are intending to use a HandiRack or HandiRack HR20 on a longer trip, then these new anti slip pads are a great solution. They provide additional stability and will stop any movement of the rack over the course of the journey. They will also stop sand and other small particles from getting trapped between the HandiRack and the roof of the car.
These 98cm x 34xcm pads are made from a soft hi-grip material. They are tailored to sit on the roof of the car underneath the HandiRack or HandiRack HR20 and can be cut to size if necessary.