I can't say really if this is true across the board...probably not... but at least in the case of rigs like mine it's not really on Ford I think. They can't control the frame lengthening and chassis overloading done by others.
Regardless. I don't personally think that these things are always necessary. Mine drives ok with proper alignment and proper tire pressures....and what bit of the "issue" that remains isn't really what is directly addressed by these steering centering devices....it's just a side benefit of them. That said, I'd like to have one of those things put on some day... mainly for the potential safety benefit in case of blow-out, etc.... which is what I believe they were primarily intended to address anyway.
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