Using the BuzzyBee 4 bike rack is a breeze. First, use the included special Buzz wrench to attach the rack to your tow ball. The patented conic system makes it easy to fit on all ISO 50mm diameter tow balls, and you can lock it with the locking knob for extra security. When loading your bikes, place the wheels in the wheel holders. The wheel holders can handle all wheelbases, and the straps will keep the wheels in place while the pads protect the rims. Then, use the attachment pads and straps to secure the bike frame on the platform. Don't forget to use the additional safety strap to tie all the bikes together. The rack comes with standard 3 - function lights and a 7 - pin plug. You can easily remove the light plate for storage. When it comes to weight, make sure each bike doesn't exceed 15kg and the total load doesn't go over 60kg. For maintenance, regularly check the straps and pads for wear and tear. Keep the tow ball attachment clean and lubricated. If you notice any issues with the locking mechanism or lights, have them checked immediately.