We are getting ready to order some running boards for our 2014 Chevy Express to make getting into and out of the van a little easier on our aging bodies. There are so many options out there - solid, tread, smooth, grip. Along with width. Any advice based on your experiences? I am thinking smooth as perhaps we may sit on it at times as we currently sit in the side door opening to put on shoes and such. I can't seem to find a measurement of how much of a drop from the van step opening to particular running boards - like what the step height would be. I have read some complaints in reviews of the board being almost level with the van step, thus not helping reduce distance to the ground, if that makes sense.