Unless they changed recently to meet California, Mass has been going by the CDL guidelines, needs to be a combination in excess of 26,001 pounds and the trailer over 10,000. Now the dually meets this spec and I checked with the registry truck team guys. If its a TT unit, yeah, class A If its a motorhome or light duty truck towing a trailer for personal things, you're not required to delve into the CDL category but its optional. California does have a non-CDL class A requirement, anyone moving a 5 ton trailer needs a Class A california license.