The time it takes to install a hitch can vary depending on the type of vehicle and the complexity of the installation. Generally, a professional installer can complete an average hitch installation in 1-2 hours. If you are installing a trailer wiring harness or other accessories, this may add additional time to your installation. It is important to make sure that all parts are properly secured and installed correctly for safety reasons. Once completed, your car should be ready for safe hauling with its new hitch. Everything you need to know about trailer hitch installation cost.