Is there any liability on the dealership if they let an employee use a car and drive drunk?

Absolutely. The vehicle was driven with permission from the owner, so drunk or sober, the owner is responsible for damages.

First, regardless of the fact that the driver of the car which damaged yours was drunk, there appears to be no question that he was at fault. Since the car was parked and nobody was injured, the only damages you can recover are for the repair of the car IF it can be repaired, for the reasonable value of the car given its condition at the time of the accident if it cannot be repaired, and loss of use of the vehicle from the date of the accident until the date a reasonable offer of compensation is given. The only real question, here, is whether the insurance company offered you a reasonable amount for your totaled car. You can find out what the reasonable value of your car is by going online to Kelley Blue Book's website and entering the make, model, mileage, and all other details about your car. KBB will give you the car's wholesale and retail values. Unless the amount you were offered is very much less than what KBB says it is, you should accept their offer. As for any other "leverage" with the dealership, you don't really have any, but if the dealer offers to make a deal with you on a new car, although it's unlikely they will do so, you can certainly negotiate with them. However, do NOT assume that just because their employee totaled your car they will be generous with you.

They generally will offer the book value of the vehicle. If you can show that it was in excellent shape, you just bought new tires or had major work down, you can possibly receive an additional amount. You can try to negotiate purchasing a vehicle from the dealership as an option for the money offered.

You can negotiate the value of the damaged car. If no injuries the insurance company will not pay anything over the value of car.

Yes, there is potential liability for punitive (punishment) damages if you can prove they knew or should have known he was impaired. Otherwise, in Alabama, the most they would owe would be the value of the car immediately before the accident. Good luck.

See an attorney, but generally will only be reimbursed for the loss which is the actual market value of the car which was destroyed.

Yes, you have leverage with the dealership. If you can prove they let their employee drive their vehicle while he was intoxicated, in addition to the damages you can get for the damage to your car, you can get punitive damages against the dealership. In order to get punitive damages, you do not have to have suffered personal injury.

You are entitled to the fair market value of your car, not a dime more. They may give you a price break to get rid of you as a nuisance but they don't owe other than the FMV. In other words you can't blackmail them. They and their insurance co know that. Just make sure you know the value of your car before you strike a deal. Check every possible source. Insurance companies like to cheat you a few bucks on all such deals so they almost always play low ball. Don't play low ball. Play high ball and see what you can do to up the ante.

Generally, insurance cos. base property damage claims on the sales of similar cars. Ask to see their comps.