Yes surely if these truckers were valued more Amazon would... install bathrooms in every van? Add a series of Amazon only toilets all over the country for drivers?
Why not work with other companies that are everywhere and have toilets ? (e.g.: Fast-foods).
Of course, it will cost money, but that's better than nothing.
> Add a series of Amazon only toilets all over the country for drivers?
Why not? Every Amazon Locker could have an Amazon Pooper.
Heck, most Amazon Lockers are at businesses with restrooms. Negotiate with these businesses to require them to allow Amazon employee access to the restrooms. And build bio-break time into the schedule.