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You won't need any sway bar with a 3500# trailer. Your hitch is plenty beefy. Get the correct ball mount and ball to get it about 18 inches off the ground and in the proper weight range and get any decent weight distribution bars and you will be fine. I pull a 31ft trailer and have never need a sway bar. Make sure your axles and tongue sit level on the trailer and you will track straight without a problem.