Just a thought to go along with dave’s tips, if your van isn’t tracking good (it pulls hard to the left or right) it may save you money in the long run to get it aligned. It should be more fuel effecient and your tires will wear more evenly. I got my car balanced and aligned not to long ago for $55.
I also realize and want to make note that it is normal for most US vehicles to pull slightly to the right, and that’s okay.