The TM shouldn't typically sway, even without sway bars. (Sway is side-to-side that might start to build on itself - left, then right, then left, then right, etc, not just feeling the air from passing semis) The weight distribution is a different issue, and most people here use weight distribution but not anti-sway on hitches.
Some things to look at:
1. Inflate the tow vehicle tires to maximum sidewall pressure if they aren't.
2. If the TM really is swaying, do you have anything on or in the TM that would cause the tongue to get lighter? Examples - heavy stuff in the back of the TM (put heavy stuff over the axles, or slightly in front of them), a bike or motorcycle on the back of the TM, etc? Is your gray water (shower and sink drain) tank full? The only TMs I've heard of with sway had weight in the back that wasn't there from the factory.
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