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A trailers tendenancy to sway has much to do with placement of the axle and the balance of the weight of the trailer. If you put the axle toward the back it won't sway but the tongue weight as a result would be way too much. Camp trailers reach a compromise and therefore usually require a sway bar while a snowmobile trailer may not. Look at a 5th wheel. The axles are toward the back and they don't need anti sway but there's a lot of weight on the 5th wheel placed on top of the TV's axle to handle it.
Another consideration is the wheel base of the tow vehicle. Imagine a small Jeep Wrangler pulling a 30 footer. It may have the horsepower but the tail would wag the dog if it started to sway probably even with a sway bar.
Once on a calm day I hit the highway after forgetting to tighten the sway bar. As trucks passed I swayed so badly that I slowed down until I could pull over and take care of it. It does make a big difference.
As far as a WD, bouncing = less ability to steer.
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Paul & Sheri SUN-0258
2012 F150 F/X 4, 6cyl Eco Boost, Max Tow pkg
2013 Rockwood 8280WS 5th wheel
2006 Sunline Solaris T-1950
2004 T@B T-16
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