Good morning , After many problems with my new Dodge Diesel I have decided to pursue the Lemon Law act here in Ca.This is not an easy decision because I really like my truck however it has become so aggravating that I feel no choice. I am considering a new Duramax 3500 HD 4x4 , which leads me to this question for Mr Beletti, Jim does Heartland have adjustable height shackles on the Big Horn or Landmark? Can they be ordered as an option? I understand that GM has a little higher bed rail as of this year and some are having clearance issues with the bed rails. I appreciate any information you can give me with respect to this question . For those of you that have the Duramax are you pleased with your Truck and how it tows ? Thanks Scott