Have you looked at different shocks or tires? My '01 Cummins 4x4 longbed quad rides pretty good, although I can only compare it to Fords. I have always been leary of the Chevy/Gm front end; to me, imho, real trucks have beefy straight axles. You do give up a little ride comfort for that though.
"E" rated tires are pretty stiff and will affect ride quality. So can shocks. Maybe the combo you got is the heavy duty type?
I have heard, but have no data, that the gm/chevy has been the most "car like" ride.
Either way, in todays truck market,, the Dodge with Cummins is best, but all three are so good, it comes down to personal preference /forums/images/graemlins/smile.gif Really though, it is hard to go wrong with any of the "Big-3"; they all make great trucks.