Ok as for the improperly balanced? Or do you mean the weight is wrong? The driver rarely has any contact with the load and any time they do is at either the receiver or the shipper. On some occasions you load and unload your trailer but that doesn't happen a lot any more. Or you have to hire a lumper. A lumper is some one that works for the company that is shipping or receiving but you have to pay them to load or unload. Ok as for the Weight. On a tractor trailer in the United States you have strict regulations. Like for instance. The front(steer) axle you can have a max of 12,000 The rear axle of the tractor you can have a max of 34,000 and the trailer axle(tandem) you can have 34,000 for a total of 80,000. That is unless you have specific permits. You can be overweight but you will need permits. Your fuel load also plays a factor in weight like you don't always just fill up. If you are getting a load that will put you toward the max then you won't be able to top up. The weight is always on the bill of laden some times its a little off but not by a lot. If it is close then you may have to adjust your tandems or in extreme cases your 5th wheel. Most drivers don't like touching the 5th wheel and will only do so when it is absolutely necessary. Places that typically ship loads that will put the tractor at 80,000 well close to it usually have scales on site. You as a driver are responsible for the weight so you have to check it and adjust. If it is over and you contact your company and they say run with it with out the proper permits then they will be liable for any tickets or anything. There are other places out there that has scales as well like CAT or some truck stops even have scales. The company will usually reimburse you for the scale use. So unless something major happens like an accident then there wont be any redistributing of loads. If your Weights are right they can't make you go in the back and move things around. Most of the time it is impossible any way due to no pallet jacks. Ok with all that being said if a cop or dot decides to inspect your load like open it up then they will have to replace the seal with one of the same or higher quality and sign the paperwork for it. Any changes in the load will then be on them for liability. That's one reason why I think it doesn't happen very often.
Some people reading this that are interested.. Trucks can handle a lot more than 80,000lbs. However, our roads cannot. If any of you ever lived near like a textile or steel plant or something along those lines that have trucks running back and forth with no weigh stations in between you may notice a few roads the ones they travel a lot are bowed inward. That is because they don't conform to weight standards and are unchecked. So to keep road maintenance at its lowest. The government mandates 80,000 max unless you have a permit or permits due to some loads being overweight and over sized. Any questions?