With regards to setting something up ahead of time. DW and I just got back from a trip to visit family in Kansas City (a 2 day drive for us). Instead of planning stops we found it better to just drive and stop with several exits marked at 8hrs, 9hrs, 10hrs, etc. on the way up we made great time and stopped at out 10hr mark at 3:30, swam, ate, relaxed. On the way home we hit traffic and after 11hrs only progressed 300miles, it was rediculous.
My point is if you make reservations, check the cancelation policy. I had no trouble walking in and getting the same OTD price as advertised by Priceline or anyone else.
Have a safe and Fun trip.
Paul