Welcome!

I would get a set of "cable chains" and put them on the front if needed. They can be installed with the tires on the ground, but I'd advise you to find a friend who is experienced to show you how. They do come with instructions, but you need to practice before you leave! You essentially have to lay them out on the ground and drive over them centering the wheels on them, then bring both ends up over the top of the tire and buckle them.

If you are going to Denver - check the weather and road conditions, and if they are favorable consider taking I-70 and US-50 the rest of the way instead of going back up to I-80.

The last time we bought tires for my stepdaughter's 1999 Grand Caravan, we got a set of BF Goodrich Touring T/A all season tires at Sam's Club. I prefer to stick with the major name brands such as BFG, Goodyear, Firestone, Bridgestone, General, or Michelin. Those particular BFG's are a good value for what they are.