Bluffs Run, Horseshoe Casino has electric/water hook ups. They have a dump site behind bathhouse which isn't bad but I have never used it. I highly recommend reservations, I believe it is $30 per night. Great Location to Downtown Omaha, I 480 is 3rd exit to the north and it is just off I-29/I-80 in Council Bluffs. It is a paved lot and spaces are not real wide.
If Dodge Park in Omaha is open, not a bad place but further drive. It is due north of downtown or you can take I-29 North to I-680, but I prefer the location of Bluffs Run.
I use the fan side of my A/C to drown out highway noise at night as it is a little noisy if that bothers you.