air springs have been existing ever since truck industry started. a set of air springs typically lasts for 15-20 years, no maintenance required. generally, only are those higher-end coaches/trucks equipped with air springs. now some of the auto factories put it on suvs...
air spring replacement is an easy task in any truck repair facilities. air spring self does not have seals. if anything goes wrong, likely the air tubes or air control valves fail; but very rarely.
