That reminds me that the Maid rite off I-80 south of Amana is closed.
However, There is a Maid-rite location near downtown Cedar rapids if your looking for a maid-rite fix Tuesday or Wednesday.
Maid-Rite West
621 1st Ave. SW
Cedar Rapids, IA 52405
319-364-4415
I-380 Exit 91C
If your traveling east or west in iowa after the rally, You could check the Maid-rite site for other locations but parking may be an issue if your rig is in tow.
http://maid-rite.com/locations.php