Thinking on a New T680

Hi guys. Forgive me in advance I've never posted here before.
I'm thinking of ordering a new T680. Not real familiar with Kenworth, have never driven one (KW) other than a day here and there.
Anyway this is what I'm considering.
T680 X15 525/1850, 18 Speed with 3:42 or possiblly even 3:55. I'm in Eastern Canada, Newfoundland to be exact and there isn't much wide open flat land here to stroll along.
Meritor axles, 4 lockers. Diamond VIT. May rule out the NAV + and do the double block of gauges. Seems to be a bunch of issues with the Nav. Is the Nav+ HD an updated version? I'm sure it'll have issues in time.
Just wanna hear different opinions from guys who are in the trucks and what options different drivers and O/O's like and dislike either interior or exterior.
Thanks in Advance
Safe Travels

 

I'd take the look of the extra gauges over the screen anyday as well Driver. Didn't need it for Navigation as my route doesn't change much up here and highway system is considerably smaller that the Interstate system drivers run in the US. No APU but a Espar or Wabasto bunker heater and an inverter with the battery charge option is also planned. No need for AC when I'm parked. Doesn't get the hot after dark

 

Yeah my fear with the Nav is its something I won't use but end up costing me money. I'm leaning toward the 3:55's myself as well on 11r22.5. I haul intermodal on a tridem chassis, we're not in the mountains like out in the Rockies but its hard terrain on fuel mileage, especially with the 3 legged wagon.
Heated/Power mirrors and heated hood mirrors, Yes. Fridge in the bunk but I dont think I'm going to go for the swivel passenger seat and table. Doesn't seem like something I'd use and I don't like how the table hangs over the bed.

 

The few guys I've heard who have tried that setup over here haven't had any lucky running tri axle loads. They didn't like the set up and haven't had a positive affect on fuel mileage. I've never ran the setup so I don't know.