Well, I would not support it. Have you ever driven an 18-wheeler? I have and you must have all your senses at alert to be safe!
Nope, I dont drive 18 wheelers. But I have seen enough drivers on their cell phones to know that hearing doesn't matter when it comes to driving.
Being deaf would make driving an 18 wheeler difficult if not absolutely impossible. Operating the truck itself {talking about 18 wheelers} requires hearing to shift gears. If you can't hear the engine you can tear the living daylights out of some very expensive equipment.
A UPS delivery van is not an 18 wheeler and someone who is deaf could likely operate it in a safe manner. There is a vast difference between the two. I think delivery van trannys are sync'd. I drove an 18 wheeler and I'm single eye functional. I passed the DOT physical too. Left eye checked, then right eye checked, and I passed. I can't use both eyes at once though. I drove OTR and had a good record.
But I have hearing and sensory issues now would make me a menace. I could still drive one but I have no business doing so. Being a UPS local delivery driver would be the same as being a local courier. There's no reason unless a person has other sensory issues then they likely couldn't do it.
A doctor though in most states has the power to have even you automobile license pulled on medical causes.
Hey I do want to tell you a good one and I saw it with my own two eyes. A local backhoe operator is an amputee his right arm IIRC. I watched him pull up in his dump truck, unload the backhoe, and dig the ditch then reload and drive off. It was a large dump truck. I listened as he pulled off and he didn't miss a gear. He proved he had the abilities to do the job.