[notanlines]

Dan, the Dakota Campground is right at the exit in Mitchell, SD, about your halfway point. $30 a night is what we paid with pull thru sites, and wide open drives. Nice people and a little water park area included. Might be a thought.
We've stayed at many Walmarts, but never unhook and only put the bedroom slide out. We call or ask first and then park where we're told. I prefer to park where the trucks park and the noise is not a problem to us.