Rock knocker
Veteran Member
So a driver of a 12,000 GVW truck towing a 12,000 GVW trailer DOES need a CDL if he crosses a state line. So if the laws are universal across the states as you state the Handbook is correct in specifying that a Class A CDL is required to tow a 10,001 GVW trailer across the state line.
You didn't pay particular attention to the very start of your flow chart. We have to assume that the Gross Combined Weight Rating for your hypothetical 12K truck and 12K trailer is 24K. So at the very start, you went the wrong way on the flow chart. Sorry