Hello, I work for a company specialized in building van bodies. The problem is our engineer left and I know nothing about pneumatics. The customer's requirement is to be able to raise and lower the roof by up to 1 m. The box bodies are 7-8 meters long, so I think 6-8 pneumatic cylinders will be required (3-4 for each side) just for the sake of even force distribution. The estimated lifting weight is 400-500 kg because the rear door frame has to be lifted too. This number could increase with snow. I need to determine how much pressure is needed in the system for the cylinders to be able to lift in order to determine if it's even doable. Can you point me in the right direction? Many thanks!