So, this thread is about driving across country in an RV with 3 female student nurses?
As for hotspots, I think most Starbucks are hot spots but if you're planning for it to be a long time, why not look into getting a wireless card with good speeds? Depending on network and connection, CDMA (Verizon & Sprint) can give you speeds around 600kbpS to 1.5MbpS (I don't know about GSM networks, though).
It might be a little expensive but could be worth it to have a constant connection.