so 4WD 18", 275/65R18 are factory ... look at BFGoodrich - Advantage T/A Sport LT. They have the mountain snowflake marking, so will be good (but not a true winter tire) in medium snow. Costco sells it as do most full-line suppliers, Discount Tire included.
This is a Michelin product; some here think that's a positive, some a negative; I live in Greenville SC where Michelin is a huge employer with many friends employed by them ... and I like their products.
Being in the group who think narrower is better for snow, and if the dealer will mount tires different than the door label, I'd choose 255/65R18 if the 111 load rating suits you (it would me), or 265/65R18 to get 114 rating. Both will throw your speedometer off a little (less than 3%).
You've several good suggestions here ... true winter tires are definitely better in snow, but these are what are now called all-weather tires, a sorta new classification.
Keep us posted on your decision as you progress.
