Air compresor PSI?

[MAC]

Please explain what is maximum psi (pound per square inch? as in tire pressure 30psi?), or simply how powerful is the air compressor, doesn’t this system need to powerful enough to lift a 4 tons vehicle? also what does it mean adjustable system wide?

What does it do beside vehicle balance and height adjustment, inflate tire, boat or doll with the hose supplied? Your question and answers seem to imply far greater uses and sophistication than the tasks indicated.