The market for lemons doesn't really apply here, because a lemon market requires a supply that is heavily weighted toward worthless goods, to drag the average down to 0 as the "best" opportunities are withdrawn from market.
Assume labor is the currency and the good is cash. If a majority of trucking employers give employees a mediocre or poor deal, then the supply of trucking jobs in the aggregate delivers poor value for the required labor input, in comparison to other lines of employment. Good firms either go out of business (due to being undercut) or retain their drivers, such that there are few openings at good firms.
In an ideal world good firms would increase their market share, but doing that requires satisfying trucking consumers and they want their goods shipped as cheaply and quickly as possible. So the interests of consumers and suppliers (of trucking services, ie drivers) are not very well aligned. I don't know what can be done about this; as a consumer I have absolutely no clue which hauling companies handle the goods I purchase, nor do I have any clue how much of a good's price consists of shipping costs. So I can't really vote with my dollars to let store owners know that I'm willing to pay a little more to support trucking companies that treat their employees well.
Nope. It just requires information asymmetry, which IS the case here. Trucking companies know more about what income their potential workers will make than the potential workers will themselves.
Experienced truckers will have less information asymmetry, but experienced truckers need to be replenished as they retire. Apparently that's not happening.
In an ideal world good firms would increase their market share, but doing that requires satisfying trucking consumers and they want their goods shipped as cheaply and quickly as possible. So the interests of consumers and suppliers (of trucking services, ie drivers) are not very well aligned. I don't know what can be done about this; as a consumer I have absolutely no clue which hauling companies handle the goods I purchase, nor do I have any clue how much of a good's price consists of shipping costs. So I can't really vote with my dollars to let store owners know that I'm willing to pay a little more to support trucking companies that treat their employees well.