Is the training from a CDL training job truly free or paid for by the company?

That depends. Some companies will deduct the price of the training from pay, while other companies will have the employee pay for the training and then reimburse them after they have stayed with the company after a set amount of time. Tuition within paid CDL training is also going to be cheaper than the private training option but students typically learn only enough to receive a CDL, so they may not be as in-depth or as comprehensive.
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