Large truck airbag systems work just like car systems only bigger, firestone makes a good bag so does Bridgestone, haldex and bendix as well as other truck part manufacturers but they are pricey, if you dont have air or bags on the bus already you need tanks(2 min), a good compressor (motor driven), gages, load leveling adjuster valves, a switch to dump air brass fittings and lots of air line. in order to make it raise and lower any other way you have to bypass the leveling valve by using two solenoids per bag(one for manual adj., one for auto lvl.) then wire in the switch to raise and lower the suspension, you can use either an electronic switch or air controlled but make sure your solenoids match. You can set it up as a stand alone bag system like you would a custom pickup, but i would suggest building it like a semi truck for safety and insurance purposes. do a lot of research on semi truck airbag systems as they are night and day difference to a car/pickup systems. there is a lot to learn about with air ride and its difficult for one to put it all on a post, but im sure with the knowledgable people on here you'll be dragging bumper and hitting trails in no time.. lol
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