Decided to check out "Transport Mode" yesterday. The "Transport Mode" onscreen button is grayed out sitting in the car in park. Stepped on the brake still grayed out. Screen indicated put car in Drive. After doing so, button turned blue. When enabling "Transport Mode", is the loud clunk sound the HV contactors opening? If so, I assume this is for safety while the car is being winched onto a flatbed? I understand the purpose of stepping on the brake because the car could roll away but what is the purpose of putting the car in drive? When you enable the "Car Wash Mode/Allow car to roll" option there is no loud clunk sound.