Just a comment...okay? My 2010 2500 Cummins with my flatbed car trailer and a 'B' body on it, I gross out at nearly 15,000 lbs. Just a bit over 10,000 lbs.
Pretty sure the federal law is if you have a truck with a gross combined weight rating over 26,000 pounds, and the trailer you are towing is over 10,000 pounds, you need a class A CDL. If just the truck has a gross vehicle weight rating of over 26,000 pounds you also need a CDL but it doesn't have to be a class A. Your 2500 with a B body on an open trailer is not CDL territory.
The police officer that pulls you over will be the one deciding if what you're doing counts as for profit or interstate commerce. That's where the real problem lies.
I will say I got my class A with air brake endorsement a month ago for work, but I still wouldn't feel comfortable yet driving a conventional 18 wheeler/40 ton rig. Most of what I tow is just over the CDL threshold.
