I am a private pilot and own my own aircraft .
I also import small inspection tools for industry.
I am prevented from taking some of these tools with me to sell when I travel to remote towns as carrying goods for the purpose of trade is deemed to be a commercial flight however I can take salesmen with me and pick up tools from local freight depot and then sell them . OK private flight.
Why? What is the safety implication of having a few tools on the back seat?