No, they aren't. It's the just buy a larger truck to haul the barge around. I would suspect that pull behind units are the same falsely applied sticker weights as well.
There really needs to be some policing of some sort concerning actual weights versus fantasy weights because while you might be able to 'haul' it sown the road, all your mechanical parts are suffering because they are overloaded as far as the truck builders specs are concerned....and, my big issue is...
In an emergency or evasive situation, does your vehicle have enough brakes to stop it and the camper? Questionable at best and that especially holds true with the smaller trucks hauling a heavier than specified load.
At least with a pull behind, you have another set of brakes. Not so with a TC. With a TC you have 2 axles and 4 brake assemblies and thats it.
The industry appears to be incapable of policing itself concerning actual weights (not all but most all), I know Four Wheel Campers and Capri weigh individual units and place that weight (dry) on each unit... I say dry, not wet. Wet is another animal but, the rest are all fantasy numbers, most likely obtained by weighing a bare bones camper minus an appliances or convenience features and applying that 'fantasy weight' to every camper built, irregardless of how they are optioned.
Sad situation that really sucks