I installed Rancho 9000's some miles ago on the '03. They were not as good as factory shocks but when haulin or road change or temp change I could stop and adjust. The stoppin was a pain and I could get close to good but never any real banana. About a month ago I installed the in cab controller. WOW, the wife says the truck feels like it's on a cushion and that is no joke.
The controller changes the shocks from 9 position to 0-100%, adjustable anywhere within the range and fine tunable for a wiz bang smoooooth ride, and I mean smooth. It was a deal installing, planning, getting through the firewall, figuring out where everything needed to be, I sheathed all the tubing in another tube for protection but we are really, really happy with the ride especially when empty. The ripples and thump thump cracks down the highway are no more. I don't adjust tire pressures up and down for load anymore only for ambient air temp. changes, I adjust the shocks and keep the tires pressured up. Wish I'd installed the controller in the beginning.
John