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So T-connected air bags cause sway too?? I thought it was bad tailer springs? Just maybe trailer sway is caused by poor front to rear trailer weight distribution, I'm going to say that usually the cause or an axle alignment issue. Weak or inadequate springs usually cause porpoising.Where air bags are worth the loss of reliability is in being able to adjust the bed height for a 5th wheel trailer. Even then I would want an onboard compressor. Be sure if you do have airbags installed to use separate fill fittings for each side. If a T connection is used then they will be less effective and there will be more sway.