How does an electronically controlled pneumatic air suspension system (ECAS - pezullimi pneumatik) maintain a constant chassis ride height regardless of cargo weight?

1. By automatically inflating or deflating rubber air bellows (jastëkët e ajrit) via height sensors and levelling valves to compensate for changes in load
2. By adding mechanical leaf spring plates under heavy loads
3. By adjusting tire inflation pressure dynamically while driving
4. By lengthening the vehicle's wheel base mechanically