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not sure why all of the numbers, but i think the question is about air bags. get them if you want them.
If you 'feel' like you need them to be level get them, they are just not necessary.
'Air Lift adjustable air springs (also called air bags) fit your existing suspension and help to properly distribute weight to all four tires, giving you a safer and more comfortable ride when towing or hauling a heavy load.'
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