planning a trip to yellowstone, road driving help needed

There is some parking for larger vehicles. However, there will be times when you will not be able to find a parking spot large enough. Mostly it will depend on time of day and time of year. You will not be able to park along the side the road, although stopping in the middle of the road is a frequent occurrence. They are not going to let you overnight in a parking lot although you may find out of the way parking spots they don't check at night.