I think one of the biggest things regardless of how you decide to proceed is to be active and able to provide info to potential buyers throughout the duration of the auction. A lot of questions can be answered preemptively with great photos (especially of the underbody/ trunk) and videos of driving and walking around the car.
Side note: I always think classic cars seem a little more 'honest' with no tint, but that's subjective.
GLWS!