If no rear overhead support uprights are present the careless operation of the reach truck can slide the main body (just above the steering tiller) of the tractor under a load beam therefore pinning the driver against the operator compartment in a shear action. Many manufacturers offer optional uprights to prevent this prolem. I have seen and heard of this happening and is mostly due to driver error.
Vince
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.