I'd go for the fans. They ARE FANtastic. I don't have experience with a 5'ver, so I'm not sure you'd need all 4 fans, but if you don't want to run the A/C much, I'd think they'd allow you to have the windows open and get some breeze. You DEFINITELY want one in the bathroom to remove steam and stench!!
1988 Coleman Sequoia - popup (1987-2007)
2012 Roo19 - hybid (2012-2015)
2016 Mini Lite 2503S - tt (2015 - ???)
2011 Traverse LT, 3.6L, FWD
2009 Silverado Ext Cab, 5.3L, 4x4, 3.73
2016 Silverado 2500HD Dbl Cab, 6.0L 4x4, 4.10