If I was going to road trip up I-15 I'd start at Snowbasin (owned by Sun Valley) expensive and can get crowded Fri-Sun or any powder day, good groom, steeps, trees, Nice resort to say you've skied it or you can skip it and take extra days at Lost Trails. Grand Targhee good groom some trees can get very foggy and very crowed on powder days . From there head over to Lost Trails Cheap only open Thur-Sun. Hero low-mid intermediate grooming on the north lift never crowed. I always try to stop there for at least two days coming or going to MCC. You have to stay 25 miles away but worth it. I like it better than Silver or Lookout. Make sure you take at least one day off before the start of of MCC to give your legs a rest for four days at Turner.