I pull sig boat with my '07 Chevy 2500HD Duramax (LBZ) w/ Allison 1000 6 Spd... 80 MPH up inclines with a trailer behind you (if you wanted to)
I pull my sig boat with the same truck (well mine, not his LOL). Mine is the 4X4 CC, LB. I also use it to tow our 30' TT with the Mule in the bed and you almost forget it's back there!
Beautiful truck, mine is the extended cab long bed.. classic body style just like yours, what a great truck, and that LBZ duramax is the best of em, and doesn't have the smog stuff related to the newer LMM diesels (in the newer bodystyle chevy's)...
One thing to remember is that DEF (SCR), while I agree not optimum, has increased fuel efficiency a LOT. Allows 2000ish engine out NOx with 2010 tailpipe emissions. It has taken me a while, but I am a true believer now.
This is exactly opposite of what I have experienced. How can DEF and superheating the exhaust with fuel increase efficiency? Of course it can't. The new engines make up for the mpg increase though other means.
I like clean diesels but using fuel to clean filters is something I don't want any part of.