As I dig through hundreds of pre-built listings of Limiteds and Laramies, I am finding it exceedingly rare to find a 2500 with the factory air suspension. From what I understand the ride quality is vastly improved with the rear bags, so I'm wondering if it's possible to swap out the coils for a factory equivalent (or better) rear air suspension. The option itself is not that expensive, but the integration (auto leveling) is what I imagine would be the difficult part to retrofit.