We are wanting to take our kids (4.5 & 9) on the ultimate road trip to Yellowstone next early June. We would only have about 9-10 days MAX. Would like to go through Black Hills South Dakota if we had enough time but Yellowstone is the priority. We would really need to do this on the cheap so I am investigating renting a minivan versus taking ours also. We are more then willing to pack a lot of our own food/snacks. This is kind of our dream trip for the kids. Are we crazy or not? Suggestions? $2,500 max budget. Can it be done on that?