My understanding is that the tires need the 3PMSF rating during weather restrictions in Utah, but maybe the M&S rating is allowed with 4wd. So I don't want to be caught on this minor detail. No argument that the bar is set low to get the rating. In Colorado, this rating is not required. I will also pick up a set of chains to have with me just in case. Don't want to miss a big snow dump day because I can't get to the resort.
I just picked up a set of wheels to mount these tires on- I don't have an issue with storing more tires as I have about the same amount of spares as you for my wife's car, and my race car. The tires that are currently on the 4Runner still have plenty of life left in them, and these new (and improved) tires won't go to waste
Plus something with a little more aggressive tread looks really cool on the vehicle