I have trained forklift drivers, now i repair the trucks they drive.
I would say there is a massive difference in training standards. Not from company to company but trainer to trainer. I here you say what ! but i have been trained by people who care about what they do, and people who dont care, as long as they get paid. Companies should except the trainers decision to fail a candidate. Not expect an automatic pass for who ever they throw at him. I found that some people can operate a fork lift better than me, very quickly with the right tuition. Some will only ever be average and no better. The way forwards is better training, better pay for the right people who will take care of your fork lifts, your goods, your building and your reputation. They are hard to find but they are out there. I found a few in my five years of training.
If the job is a trade, give them recognition, see what happens.
regards
Andy R UK