Pittsburgh, Pa to Santa Cruz, CA

I wouldn't take I-80 in the motorhome if I even thought a storm was near. And yes, you are supposed to carry chains in the winter, but the only place I've ever been checked to see if I was carrying them was going into Yosemite Park. Otherwise on I-80 they don't check. I actually did buy cable chains for motorhome and I have them in the basement, but my plan is to never ever have to use them. I have gone over to Vegas in the winter several times when the weather was iffy, so I made sure I had them. But the highest altitude when going to Vegas is less than 5,000 feet.