The trick was coming up with a simple storage/charging method. Below is what I came up with as a simple, cost effective method for storage and transportation of the iPads.
1) Plastic file organizer
2) Power strip--drilled holes on back of tub and zip tied the power strip to the back.
3) Velcro--drilled holes on side and zip tied some Velcro to hold the cord when not charging.
4) Spade bit used to drill hole through back for iPad power cords to run inside of box.
5) iPads can sit vertical or horizontal and charge.
We already had the power strips but the tubs were $10 at Wal-Mart. Zip ties were $3 for a 100. You could get a power strip for $10 or less.