Have Sumo's on front (for porpoising - bouncing and its was an easy install) and Safe-T-Plus (for side wind/trucks) on steering. Front end alignment is a must. I have never had any issue with rear end swaying even when towing a jeep in high gusty winds. But I have a 25.3 on E450, not an E350.
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2016 Thor Axis 25.3 w/ 2011 2dr Wrangler in tow
Demco tow bar with Patriot braking
Bigfoot Automatic Levelers.
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