My friend and myself are loading up an RV with a PC loaded with our favorite digital music and a wireless access point (for remoting into the "jukebox" from our laptops), and driving from Mitchell, SD to Des Moines, IA. We hope to make the trip fun and we don't even have to find a hotel room

. A question though, we were just thinking of finding a public 24hour parking lot to stay at night, but is there a place around the convention complex that has night rv parking? We were hoping it would be alright to park at the convention parking lot, if this is not alright with them could someone let me know before we leave so we can adjust our plans.
Thanks,
Mike