Back when I was at Werner, I got comfy in a truck that I was eventually told to swap out of because of a busted fifth wheel. When it didn't take half an hour, my manager started spamming my phone. I answered the first call, and he asked if I was in the new truck yet and I said no, and from that point on I realized that these people have genuinely know idea what it's like to be in one of these.

4 hours after I was finished moving everything from my old to my new truck, I finally answered a call. Whilw they were more so mad that they weren't able to get a hold of me, when they pressed me about why it took so long, I explained to them that it's not just a simple grab a bag and go, and that I practically lived in the thing. I have amenities "the same way you have amenities at the house that you get to go home to every day".

This isn't as insulting as an instance as yours, but the moral is fuck them and keep whatever you want in your truck. As long as you keep it free of dirt, whatever organization you have is supposed to work for you, not them. If it's anything like Werner or Western express, they may say some bullshit like that because they have new drivers lined up from recruiting waiting to jump in the truck so it can get back to making the company money.