| Everything comes down to costs these days.. it's simply cheaper to make one circuit board a million times, then to make 5 different models of circuit board 200,000 times each. I'm willing to bet most of the vehicles come with everything you need for most options, save for the external knobs and gizmos associated with them. For example.. I see the readout and display for the sonar is in all the trucks - i bet you just need to turn this display "on" and then connect the sonar sensors. You can probably get that accomplished in the same manner, and buy aftermarket sonar sensors very cheaply.
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