What I noticed pulling my TT no bars, vs basics WD vs fuel cam with a 3500 CC GM LB. Approx 650-750 HW and 6000-6500 lb on axles depending on if a weekend, long week, ski weekend...
ALL setups stable, no uncontrolled fishtail sway etc.
When I did notice a difference, it was cross winds. Trailer leaned and moved side to side more without. Less with WD, less yet with dual cam. If that's not an issue to you, great. If the wind was strong enough, I would suspect the trailer would go over sideways with out, vs whole kit and caboodle with the dual cam attached.
I do admit, u preferred bars attached. Reality I was fine. I barely pulled but 60-80 lbs off the FA attached.
Marty