unfair charge for unit damage caused driver

There is such a thing as illegal and unenforceable contracts/clauses. Ones that will never hold up in court. If the amount is over a few hundred dollars get an attorney.
Is an Employee Responsible for Damage to Company Property? - LegalClarity

 

Unless a driver has signed a form stating he is responsible for any damage and he will pay the cost of repairs, the company cannot legally take money out of the driver's pay. This goes for anything. You even have to sign for taxes to be deducted from your pay.

 

Im aware of it. I would never work for one no matter how desperate I was, but I am indeed aware of it.

 

If I'm paying for anything, I'm paying off the invoice, not the estimate. That's all you really need to do - insist on seeing the final invoice.

That said - its not your stuff, don't pay for it. They can fire you, but that's it.