Don’t assume equipment for lifting and/or moving will function safely and is safely positioned. The equipment must be not only in safe condition, but it must also be on a stable surface and kept from being put into unstable positions.
An unstable surface could be gravel, for example. If you are using a lift indoors, check to see if the floor has chips or other deformities that can cause equipment to tilt. How close is the equipment to a ramp or other incline? Are the roller feet fully locked (or locked at all) once the equipment is in lifting position?
Failing to use stabilizer bars or stabilizer legs as recommended for the particular application can also render equipment unstable and likely to tip over.
Load instability can present a significant hazard. Always check the load to ensure the geometry of how it is supported will have it in a state of balance when lifted. Then look at the support and lifting devices; ensure any straps are undamaged and all clips and brackets are properly engaged.