Maybe it's because that's all I've had in the Trooper, but it don't find the HD OME springs stiff and harsh... Trooper probably has a bit more weight out back, though.
Though I'm limited to 40hrs a week, and have a pretty "set" schedule, I do the work of my two bosses on top of my own, so let's just say I work far more than 40 at a third of their pay. It's swell... As I type. From my work desk. *sigh*
I have had my OME setup (nitrocharger sports all around and springs rear) for over a year now and love them. They have a nice ride but are good at soaking up washboard/rutted roads at speed.