Re: some general questions about the crd
Having driven the Hemi and owned a CRD I'd stick with the CRD. Driving diesel gives a different feel than gas but once you adapt it's great. Towing is the same for both but you'll get noticeably better mileage out of the CRD. The mileage is what really sets the two apart.
I live in the NWT and never had issues with the CRD in the cold. They are equipped with electric ceramic heaters so warm air comes on pretty quickly. I usually start it up and let it idle 1-2 minutes before I go for oil pressure and such, within a few minutes it's blowing warm air. Never used any additives. I use the block heater past -15*C but I have had it start down to -30*C without the block heater, though I'd definitely avoid doing that more than once or twice. Try to avoid excessive idling.
Make sure you use the right oil (meets MB 229.51 specs i.e Mobile1 5W-40 ESP Formula) and try to get diesel from a station that sees a lot of traffic so fuel is fresh. Work the engine every once and a while, if you'll be towing a load in the 5000lb range every once and a while that should do the trick.
2008 GC CRD, OME 2" lift kit, 265/70/R17 Cooper Discoverer S/T's, 1.5" Spidertrax spacers, 50W HID conversion from AAC
, AEM Dryflow universal cone air filter, gutted turbo resonator, Racor CCV3500 Filter