Done With Clean-up

Three days of hauling stuff from the garage and basement and it looks like we are done. I hope it isn't more than a ton or it will cost me extra.
I don't know why they do that, I order a 10 yard bin that has a one ton rating yet the 20 yard bin has a two ton rating. The 20 yard bin is the same size except for the height which is one foot higher, go figure!!!
Now, they expect you not to go over the weight limit of the bin. How do you do that, weigh everything before you put it in???