Boandme, hey when you get ready to show your Dmax some love, send me a pm...I know those trucks like the palm of my hand and could help you out some or point you in the right direction.
Will do man thanks! It's got a level kit but just stock wheels and tires basically. Like I said I would like to do a 4" lift with 35" tires if possible. I have done a little research and found mixed results on the 35"s fitting. I guess probably depends a lot on wheel selection. If I did the 4" lift I would want to do it right so I can still tow my fifth wheel without any problems all the way around. I LOVE my 08 Duramax, no URINE to deal with and sooo much power!