We are traveling from Florida to Chicago in our motorhome for the first time. Every map I pull takes us I-57 out of Nashvillle into Chicago. However when I look on the atlas, it appears that I-65 would be the same distance, if not a little shorter. Does it make a difference which one we take? I know that 65 goes through both Louisville & Indianapolis while 57 doesn't go through any big cities. Is one better vs. the other to travel via motorhome? Any opinions?