Rear air bags too
Ditto all the other advice: alignment, sway bars, spring boosters, steering damper, shocks. My Vegas is on the E-350 chassis which has softer springs in the rear and maybe the front than the E-450. Anyway, I wanted a "tunable" ride so I put air bags on the rear axel and adjust the pressure with a bicycle pump. Now it is reasonable in cross winds, rides OK, plus I can keep up with the regular traffic on a curvey road. As delivered, IMHO, the E-350 Vegas is unsafe in any crosswind.
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