[QUOTE=screenerx]The Rapiscan series does have a steel table right before the belt to stop this. It's really nice, in that it won't let a item be pushed off when the machine goes in reverse like it does.QUOTE]
The Smith Heimann has a steel roller table also but it is only a few feet long. Once the bags are stacked up it is useless to save the last bag.
There use to be a "bin loader" position but since the staffing levels are low it has been eliminated in most airports.