Trucks and options.

Dear R Ver's
I am buying a 34 Select which gives me a total axle wieght of this unit at 17000 lbs loaded.
My question is I am looking at a Chevrolet 3500 HD LTZ, would I require a Dually or would a standard 4 wheel drive unit be OK I would rather have too much power than too little . It will have the Duramax and Allison Transmission fitted. I have been told by the dealer that I would not need the additional exhaust brake unit fitted ? because it has an item fitted to the transmission which alters the ratios when on hills and slopes. And would your readers also recommend that I have the engine "Chipped" up.

Really appreciate your thought on these.

Kind regards.

C & P