Again, you are talking to an insurance company, they will tell you that you need flood insurance if you live on a mountain.
I am not required to register my vehicle as a commercial vehicle because;
*the vehicles main purpose (as it is used the majority of the time) is for personal use
*the weights of the truck and trailer are below the state minimum
*the truck and trailer are "Not For Hire" meaning I do not use the vehicle to haul persons or other person property for any form of payment
Since I am not required to register them as commercial vehicles, the insurance company can not require me to purchase "commercial insurance.
However, since I do use my "personal" vehicle for "business" purposes on occasion, I pay a slightly higher (less then $40 yr.)
So you can call every insurance company/agent is Missouri if you care to, it doesn't change the "Law".