Please note, before using the bottle jacks, please check for pressure holding. As sometimes, new hydraulic jacks etc. Need to be bled before heavy use. Always make sure the handbrake is on and the car is in gear.
Use wheel chokes on the wheels that are not on the ramps. Avoid working alone under a car or van if possible. It is up to you, the customer, to adhere to regular safety practices when using this sort of equipment.