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Most get about 45 to 50K out of the Firestones, from my experience and other forum contributors they have been a reliable tire. For some reason the rears wear faster than the fronts, I think it is a combination of the exhaust brake and tread distortion under load.
Now for the steps, nothing beets the AMP retractable steps, I hope they worked out the electronics for the "18"s. Early on FCA tightened up access to the Can-Bus, the ability for aftermarket products to interact with the vehicles electronics. The steps must open when a door is opened and retract when closed.
I chose a less expensive option from N-fab, Podium steps.
With the Aisin and HO Cummins you will be amazed.
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