Fridges usually need several hours to get down to temperature. Let's say 3 hrs. That leaves you a total of 5 hours of "run time" while you're camping, say 2 hrs/day for 2-1/2 days. That would get you through the weekend, but it's assuming you're not running ANYTHING else. And I don't have a clue if 2 hrs run time a day is enough.
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