In my experience, motor carrier safety regulations are open to various interpretations, so it is probably a good idea to check with your state DOT as well as with the local Carrier Enforcement department in your state. They are supposed to have the current information necessary to assist you in remaining compliant. The USDOT site has links to all the state DOT sites.

Again, the information can be contradictory, so find the most knowledgeable people you can, the fines ramp up steeply from my paltry hundred dollars. Don't bet the company on the word of some functionary, ask the questions you need to, in order to get the clearest answers possible.

https://www.thesocialmediapros.com/pressure-washing-website-design/