This is bull, you do not need a corp code to get "X" plates, but you do need one to register in the company name. You do not need to register in the company name to get "X" plates. If your vehicle has "X" plates it must be lettered and have a commercial policy. If your commercial policy is in the company name you need to have the vehicles registered owner attached to it.
If you use your vehicle for commercial purposes it must have "X" plates, be lettered, and have a commercial policy. Yes mowing lawns is a commercial operation. In addition if you have an "X" vehicle you will need additional permits/licenses to haul debris, carry pesticides, offer any other service than cutting, have an amber light, and cross state lines. Why do you guys think we get upset when Jonny Just Cuts pulls up in his passenger S-10 to cut a lawn and apply some weed n feed and spread some bagged mulch.