http://www.bulletproofsuspension.net/contact.php
Call Bryan at Bulletproof. He is the owner, he will answer all your questions.
My buddy has a 8" lift on his 07' Duramax and you can feel just about every bump. I have been in a lot of trucks with the BUllet lift but not the Titan yet. They are massive lifts if you plan on running 37" tires.
What exactly do you want to know on how it handles offroad?