Need some more advice from about routes. I've always wanted to go to Custer State Park, SD to see all the wildlife. A RV'er guide in Alaska told me it was one of his favorite parks for wildlife. We would take 15 north from San Diego then turn east to go to Jackson Hole. I was wondering if we should stick on the major freeways, 25 & 90, to get to Custer State Park from Jackson Hole or take the more direct road 18 and 86. Thanks as always for the great advice