Have the car re-aligned and request castor be set to the high side. Another cause is road rutting, the distance between steer tires is narrower than the ruts in the road surface. When one steer tire is in a rut the other tires is not, then the car tries to follow the deepest rut as your driving moves about in your lane.
I have driven some highways where my Silverado wandered and in the MH it felt like the tail was wagging the dog-so to speak.
Other highways the Silverado pulls smooth and tracks straight.
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2000 Winnebago Ultimate Freedom USQ40JD, ISC 8.3 Cummins 350, Spartan MM Chassis. USA 1SG, retired;PPA,Good Sam Life member,FMCA. "We the people are the rightful masters of both the Congress and the Courts - not to overthrow the Constitution but to overthrow men who pervert the Constitution." Abraham Lincoln
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