Moving to an extreme climate, you will learn a few things, including batteries.
My advice is to fit the largest CCA flooded battery that fits with a reputable brand and ideally something you have access to in AK if the warranty is needed.
I've tried Optima and they just have not survived for me. Supposedly need a special charger for gel cell batteries and I just don't think they are designed for a volatile environment with extreme temps, multiple discharges, jump starts, and trickle chargers. Maybe they got better in the last 5 years, but before that . I played the warranty game with them and they honored it, but I was the guy that had listen to the dreaded 'click'. But they look nice and if you want mount it upside down, you can.
If you do get Optima, waste that money on the red, not the yellow. Unless you need deep cell by running juice while alternator is off (lights, radio, or equipment while parked), what you are really interested in is a big punch of CCA when it gets cold, which is what the red is designed for. Yellow trades off CCA for deep cell so it is up to the task of providing battery power standalone but typically give up CCA for same group size. Typically the applications I looked at gave up 50 CCA for yellow and really, I use my batteries for starting only. Cold weather = CCA is king.
There are actually very few battery manufacturers that make the lions share of the market. Interstate is one of Johnson Control's premiere brands and that's a brand I've had luck with surviving more than 4 Minnesota Winters. The traditional flooded batteries with oversized CCA will continue to fight at the level you need after years of taking lumps.
When you start hitting -30 -40 stuff, pull your dipstick out before hitting the starter. You'll know if it's not time to go. If it's taffy, light a bed of coals under the truck, that's got me going pretty fast before. Don't try to put in thinner oil than our spec'd 5-30. Best bet is to get a block heater to plug car in, and battery blanket good idea too. But still check your dip stick on the stupid days.
Don't let your gas tank stay low, it will reduce your chance of freezing moisture in the gas lines. Get the lowest rated washer fluid possible. Once it freezes, you're boned. Get a survival kit and keep a rated sleeping bag in bag. Not kidding. If your car won't start or konks it can save your life.
Why you doing this?