I don't know the law on that but when you do that you are taking pressure off the mast carriage that can cause the chains to come off the rollers and if that happens the carriage could drop to the floor when backing out not a good problem. The lift were made to pick up a load not to crush it l would look into getting a ballier.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.