New Jersey two week road trip to Yellowstone?

My friends and I plan on heading out west this summer, but unfortunately we only have two weeks to do so. We plan on driving non stop most of the time. Probably rarely staying at motels except when we're at the destinations themselves. What's the best route to take and things to see either on the way there or on the way home? Also, is two weeks enough to do a good amount of things? Our main objectives are rushmore, yellowstone, and the tetons. Thanks!