When I lived in Fairbanks, AK, I'd run the winterfront on my '99 and '02 anytime the temps dropped below 30F. When it dropped below 0F, I zipped the front completely shut. Never had any problems with EGT or overheating, either towing or empty. I've bought "winterizing" kits from the dealership, and I've installed them myself. The dealership kit for my '99 was $450, and didn't include a winterfront. I purchased that separately from a tent manufacturing company for $45. The kit did include battery heater pads, an oil pan heater pad, a transmission heater pad and idle-speed control. The block heater was standard on the '99 and '02. The big expense was $299 for a high-idle switch, which did nothing more than increase the idle speed using the cruise control servo. When I bought my '02, I decided to winterize it myself, and bought all the components (minus the high-idle) from Napa for a little over $35, plus another $10 for a three-outlet 3ft extension cord. Long story short: Buy the parts and do it yourself... you'll save a bunch of money.