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Bob, bad news. You may not need a CDL, but according to WI statute you need a USDOT number. The number is free, but the "other stuff" is far far far from free. Commercial insurance, drivers log, inspections, etc etc.
Here's a WI link on the need for the USDOT number. Look at page #3 closely. As it reads, it does NOT matter if you are "commercial" or private. If the truck and trailer with load is 10,001 pounds or more -- you NEED it. The only exclusion is for intrastate travel only IF you have farm plates on the truck AND trailer. This is a WI statute -- not federal. http://www.dot.wisconsin.gov/statepatrol/docs/usdot.pdf