Hmm, actually - it is a horrible answer to your question - but I had to describe a part of life I lived too...
When one is a company driver, or trucker for hire - they get a job with a truck and told where to go to pick it up and where to go to drop it off.
You get the basic juxtaposition of that - but what does that have to do with the answer to the question you raised...
The company you work for gives you a set of rules to play their game by. One of the main ones is their fleet is owned by them, not you - you don't put anything on it or in it unless you are willing to leave it behind and lose it.
So many "move in" with a luggage carry-on and a boombox holding their radio equipment - the truck - if it has a provision for CB - will offer antennas they consider "useable" for the purpose intended.
They also know that if you use a CB - you also are expected to know how to operate it.
You have to put your stuff in the truck in a way that it will work with their equipment.
Some companies only offer a cigarette lighter plug and the coax laying coiled up either in the overhead console or laying on the floor.
Some companies will even give you a radio to use - see the "Rules" paragraph above - it belongs to them not you.
So in light of what has been done to the radio - the company - if they supply them, has the final say in the matter.
They also want "fairness" - it's their LOGO on the trucks - you drive for them. IF you roll it, smash it, or crash it and it gets the 8 o'clock morning news and the overhead helicopter - well, you know you'll be staying right where you're at - so enjoy your morning Wheaties breakfast and find something else to do. The Fairness part means they don't want anything you did, embarrassing them during any sort of investigation - being pulled over or even a moving infraction of speeding - your license - their truck, you get the points. (For those whom may say, well the shop didn't tighten up the air line fitting - causing my trailers tires to lock up and I crashed because of it - the burden of proof is on you - your truck your pre-trip - your life - your responsibility.)
So if you took out their radio and put in your Hi-Po miracle and you get pulled over or noticed by other drivers - they may take you to the task of putting your money where your mouth is. Meaning they may bother to call the company and ask why they have a driver out here harassing us while we're trying to do our jobs? IF the company monitors channels even in the yard and hear this kind of poor conduct - they may not ask you to return the next day or ever. Many companies use their drivers as a sign of quality, productivity and performance - if you're out there embarrassing the company by name or by intentionally interfering and angering other drivers - someone's going to know about it
What does this have to do with those radios - a lot. That is the "Fairness part" they are bolted in secured and mostly foolproof, but there will always be one or several that are taken to the task of removing the hapless innocent radio - opening those radios' up and doing things to them to make them - "non-stock".. So the company every now and then has to upgrade/update their line of trucks with newer equipment - so goes the radio. I've seen then "glued" the mic to the radio as well as weld cases shut. This generates a discourse amongst the team members a.k.a - slip seaters to start looking elsewhere and find jobs allowing them the opportunities this company is NOT letting them have. So - the moral of the story as well as the morale of the company - forces the company to install cheaper and more basic function radios as part of their requirement to do the jobs the yard needs done. The company operates this way to also lessen their losses from the clowns that want to leave a bad taste in the mouths of others whom will be driving the truck after they leave.
Brings up the old cliché...
Kinda' brings a tear to ones' eyes
...*sniff*...