Gotta say i totally agree with mattB110 on all his points of view,i've been punting these things in a controlled environment for longer than i care to admit.One thing i have learned along the way and are prepared to share is i have had more sucess with"soft low" rear springs and quality shocks than "hard low" rear springs on the back of any datto,this has nothing to do with ride quality,it's about weight transfer and putting power down on the ground. Organise getting your Datto on some corner scales before adding extra leaves in the back.
Anyone hazard a guess at rear corner weights of a 1200 ute?