Using this Ezi - Grip Enduro 4 rack is easy. First, make sure your vehicle has a standard 50 mm towball. Then, attach the rack to the towball securely. Adjust the wheel tray position according to the size of your bikes to make sure they fit well. You can place up to 4 bikes on the rack, but don't exceed the 60kg weight limit. When you don't have bikes on the rack, fold down the center post to access your boot. The lightboard is a great safety feature, so make sure it's working before you hit the road. As for maintenance, regularly check the rubber sleeves and the center post cradle for any signs of wear. Clean the rack with mild soap and water to keep it in good condition. And always remember, this rack only fits standard 50 mm towballs, so don't try to use it with other types of towballs.