You can go with the same size or a bit narrower as it allows the snow tire to cut into the snow instead of trying to climb it.
I never used to believe in them until I got my first set now every car in the stable has a set.
There's no hiding reprogramming from the mfrs anymore, flashing or modules. The systems record everything and when a dealer plugs in they'll see any changes and/or change back to stock.
If you fart on the seat they can tell if it was Taco Bell or White Castles.
I miss my F150 door pockets that were deep enough to actually hold things. The Mav's gimmicky "water bottle" design and shallow depth essentially make them useless.
It is a conspiracy but you've only touched the tip of the iceberg. It's not Ford or politicians or the scientists. It's the true puppet masters behind all these conspiracies.
It's the Tin Foil Manufacturers Association.
If they did you got it for free.
And in the theme of your thread this is why I walked from the original dealer I ordered from and bought off the lot from a reputable dealer.