I don't see how those racks mounted on the axle can work without bump steer, JMO. If the column shaft was horizontal or perpendicular with the frame it might work, but with the angle they have and the front axle moving up and down, I really don't see how they can be a good set-up.
I'll tell you either go the route Norm did with the Ford, Toyota box or clip the frame as I did, are
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Dodge Sweptline Truck General Discussion