It's important to note that we are not affiliated with Tesla, and that the "Tesla" name, along with "Model 3", "Model Y" and other material, belong to "Tesla, Inc.". We are an independent service provider offering support and features for your Tesla vehicle.
During your appointment, you will not be able to drive your vehicle, much like you can't drive it during a normal update process. Your vehicle must remain parked and unoccupied, but you can access it to retrieve personal possessions, for example.
You must read the owner's manual for your vehicle, which you can find here, and familiarise yourself with the "Towing and Accessories" section. This section explains how to safely use Trailer Mode with your vehicle.
You must ensure that; any trailer hitch installed meets all legal and regulatory requirements, that you are suitably qualified to tow and never exceed the stated towing capacity of your vehicle.