Looking at the federal website I have decided that as a lawn care company a usdot# is not needed. However, nowhere can I find if any IDOT or ICC/MC #s are needed in illinois. I know farmers have to have them but that has to do with the grain they haul. My question is (for you illinois people) do we need any numbers on our trucks since they are commercial vehicles? I know if you run D plates they have to be inspected. But dont know about dot numbers.