I don't tow with the fridge running, either. First day we just through everything in a cooler. After that, it stays cold enough on the road. I have a remote temp sender I put in the fridge that I can monitor in the truck. It'll stay under 40F for hours.
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