Please see the links below. https://360insight.ridgidapps.com/Attachment/Download/1526627/BC-210%20810A%20Mounting%20Dimensions.pdf https://360insight.ridgidapps.com/Attachment/Download/1526626/BC%20Vise%20Dimensional%20Sheet.pdf
I have attached the dimensions in the two pictures. Thanks.
We do not place a rating on the vice in that orientation as it was not designed to be used that way.
We do not recommend extending the cable on our vises as they have the correct length for the capacity off the vise. We do offer replacement chains in case your has broken and we also offer links for repair. We do offer tristand chain vises with a 12 inch capacity if you would be interested in that option. Those can be found on our website www.ridgid.com or more information can be obtained by calling 888-743-4333. Thank you RIDGID