Not all truck drivers wear diapers but some truck drivers do wear diapers.
I was working at a loading dock around 10 years ago and I noticed when a guy truck driver probably about age 25 years old was wearing a diaper.
I could see the diaper sticking out of his waistband as it had shiny white plastic and was a medical grade diaper which I think it said Attends on it.
I'm not sure if he was incontinent or just wore the diapers for convenience but I don't ask people as it would have probably embarrassed him and it was none of my business.
Diapers for truckers would be a good idea though or anyone traveling.
I wear adult disposable diapers on long road trips myself because sometimes it's hard to find a toilet.
And especially now when I go places there are some places that have the bathrooms locked and then I need to pee.
So I have started wearing adult disposable diapers out when I go shopping or go somewhere where they might not have a restroom.