From the DOT at:
http://www.fmcsa. dot.gov/safetyprogs/cdl.htm
Drivers need CDLs if they are in interstate, intrastate, or foreign commerce and drive a vehicle that meets one of the following definitions of a CMV:
Classes of License:
The Federal standard requires States to issue a CDL to drivers according to the following license classifications:
Class A -- Any combination of vehicles with a GCWR of 26,001 or more pounds provided the GVWR of the vehicle(s) being towed is in excess of 10,000 pounds.
Class B -- Any single vehicle with a GVWR of 26,001 or more pounds, or any such vehicle towing a vehicle not in excess of 10,000 pounds GVWR.
Class C -- Any single vehicle, or combination of vehicles, that does not meet the definition of Class A or Class B, but is either designed to transport 16 or more passengers, including the driver, or is placarded for hazardous materials.
The difference between Class A and Class B appears to be the Class A CDL is licensed to tow trailers (GCWR) and Class B CDL is not licensed to tow trailers but can drive a truck to carry over 26,001 lbs (GVWR). The Class B allows towing a small trailer up to 10,000 lbs.
The GCWR or GVWR of your tow vehicle (on the vehicle license), determines if you need a CDL provided you are towing something for hire or used in commerce.
The case of using your RAM to tow your backhoe to the next job (e. g. backhoe for hire) could get you a ticket if weighed and the total is over 26,001 lbs. Your 3500 truck was licensed for GVWR, should have been licensed for GCWR, and you need a CDL.
The federal law implies that a RV with a combined weight over 26,001 lbs still does not require a CDL if towing for your own use. That is probably why you periodically see big rigs with "Not for hire" painted on the door. I would check regulations for GCWRs over 26001 more carefully. Someone delivering big fifth wheels (combined rig weight over 26,001 lbs) for pay with a RAM needs a Class A CDL.
[This message has been edited by Boldt's Wagon (edited 02-28-2001). ]