Though I am loathe to admit it, I actually run the 5100 on my white truck for that very reason!!
That being said, it is still my understanding that the 4600 are valved for our stock height/weight trucks and from ALL I have read, the people who run them on their diesel tricks, love them…they say that they ride a little softer then the 5100, though I have ZERO complaints about how my 5100 ride and handle.