I searched though the V20 PDF but couldn't find any advanced statistics (anything beyond maneuverability) for vehicles in V20. I'd like to have some armed players participate in a car chase and I'm wondering a) what kind of soak common vehicles have b) how many health levels different vehicles might have. This would be just for targeting the vehicle, not called shots at the tires/attempting to blow out windows, or targeting NPCs inside the opposing car (which I am assuming I would treat as behind cover)
Note that this is probably not THE answer, but AN answer.
I looked through some books but the only book I have been able to find any kind of information is World of Darkness: Armory. Unfortunately this is for the New World of Darkness, so it's not really what you are looking for. However, AFAIK the damage levels for humans and object didn't really change that much between cwod and nwod, so it might at least get your bearing.
Durability: This is the vehicle’s material hardness. Any attack against the vehicle has the vehicle’s Durability subtracted from its successes before damage is applied.
Structure: This is the amount of damage the vehicle’s body and frame can endure.
World of Darkness: Armory, p.132
Type - Durability - Structure
Subcompact Car 2 10
Compact Car 3 12
Mid-Size Car 3 15
Performance Mid-Size 3 15
Full-Size Car 3 17
Limousine 3 22
Police Car 3 17
Sports Car 2 12
Muscle Car 3 15
Sport Compact 3 12
Supercar 2 12
WoD: Armory, p. 135
So, for a regular car, you could say that it takes about 15 damage to render it destroyed, you can find more examples in that book - trucks, vans, bikes, even heavy duty construction vehicles. They follow a similar progression.
However, I'd like to leave a comment that it should be taken with a pinch of salt. These are all stats measured as if you were unloading on an empty car expecting to destroy it. During a car chase these would actually be rendered moot, as a seemingly innocent amount of damage (smashing front window or activating airbags) can cause the driver to lose control over the vehicle and do the extra 10+ levels of damage in a resulting car crash. Think of it this way: just as a human suffers losses to his Dice Pool when injured, the car would be progressively harder to control when driven in a banged-up state.
Also, do not confuse Durability with Armor. Just because the engine is tough enough to make most handgun bullets ricochet off its surface (durability 3 perhaps?) does not mean the characters inside are similarly protected. I'd say that a regular car from the table has indeed 3 Durability, but only 1 Armor. Sheet metal could at best redirect some glancing blows.
Remember, that being concealment does not equal cover. See TVTropes. The shooter will know where the driver is and there is little apart from some rebars that could stop the bullet flying at him. So if you play any kind of semi-realistic game, do not treat people inside a car as in cover.
Of course, if your campaign is less about simulationism and more about gamism, this might be acceptable, but make a conscious break from reality rather than unintended misinterpretation.