1. 90% of questions asked about a car are standard (e.g. what's the history, what's the mechanical, is it a clean carfax). We can pre-empt this by having the answer ready.
2. For answers we don't have, it's the standard "let me get back to you" and ask the seller.
last thing I thought of - how is the communication facilitated? ex: asking questions about the vehicle's history