What it means is that you can now legally travel down the interstate highways and cross the bridges with a rear axle weight of 24,000 lbs just like a passenger bus. Passenger buses have always been exempted to 24,000 lbs. Before this was passed RV's were limited to 20,000 lbs rear axle weight. Some people, such as myself, had only two axles and had a weight rating of 23,000 lbs (or something over 20,000 lbs) on the rear axle. Technically, if I exceeded the 20K limit or was pulled over and checked I was subject to a fine. That was why a lot of the newer Class A's had a tag axle installed. Some of the units can now revert back to 2 axles instead of 3. Saves initial cost and reduced maintenance costs for the additional axle and tires.
This has nothing to do with licensing, it is a mechanical issue related to the weight of the rig on the highwaysand in particular, the bridges.
I hope this clears up the issue.
Good luck and safee travels.
Doug & Connie
2001 Holiday Rambler Imperial 41ft PBD 370hp ISL AF1 braking system
2001 Subaru Forester manual toad