I am extremely thankful that my carrier has not expected, nor offered, to have a unit load more than its legal and safe capacity.
Once, I got a call to pick up from a shipper and I knew they did not have a scale that could weigh the entire bin once it was loaded. I asked what was the weight of the load. The dispatcher said, "Around 2800lbs." I explained the situation with that particular company and she called them to get a piece count on the load. She waited a few minutes and asked the next shipping employee that picked up the phone if he knew the weight of one of the pieces in that load. After doing the math she called me and said, they decided they needed a straight truck. The load would have been over 3000lbs. I thanked her for her efforts and consideration.