Not an RV, but I was with 4 charter busses of band kids on the way to a concert. One was overweight and they were not allowed to proceed. Had to shuffle kids between coaches and move baggage to the equipment truck before we could leave...
There is no way anyone ever received a ticket for being overweight. The only law regarding weight is you can not exceed 20,000 lbs per axle or 80,000 lbs gross weight. Anyone have an RV approaching either of those numbers? There is in some jurisdiction a "registration" weight. In those areas the more weight you want to tow, the higher your vehicle license plate fees. So if you want to tow more, you pay more. There is no limit to how much your can "registration" weight can be. If you didn't pay the proper vehicle license plate fee, you could be ticketed for exceeding your "registered" weight.
Spring time. Another 'overweight question".
Do you really think your rig or any rig is even close to approaching the max weight limits? Seriously?
As nickthehunter pointed out max axle weights are usually 20,000 lbs for a single axle, 34,000 for a tandem axle and 80,000 gross (total) weight.
When talking those 'big' numbers people's eyes glaze over and they don't have any concept of what they mean.
Let's put it in perspective looking at a 5th wheel. Your truck weights 8000 or a bit less. You have a heavy 5th wheel that weighs 15,000 lbs loaded. Total weight then is 23,000 lbs.
Now lets look at the semis running down the road. Look at one that has one of the 53 ft box trailers. The tractor unit is a long nose double sleeper, long wheelbase rig. Empty that combination will weigh about 23,000 lbs, maybe a bit less.
Look at the those numbers again. That empty semi weighs the same as if you had a heavy pickup and a fully loaded 5er.
When people truly understand weight laws then they would see just how silly these questions really are. They think because they have a 'big' camper that somehow they're in the big boy's league of hauling weight. Not even close. Think about it. Your truck and camper have tires which may be the same load handling capacity as what's on your car or maybe just a bit more. If your rig was over 20,000 axle (10,000 per tire) do you think your tires wouldn't give out long before you maxed 20,000?
And yeah, I was the weight police. The real weight police. I didn't get my knowledge from listening to some fat guy sitting around the campfire. For 27 years I weighed a lot of trucks, taught truck weight laws, was recognized by the courts as an expert in truck weight laws, and commanded the highest fine generating scales in the state of IL.