How much current does the Coleman cooler draw? Does the AC adapter you show support that much current?
The adapter is definitely the way to go if you always have shore power. However, if the cooler draws less than 6 amps it should be no problem for your converter.
Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD
EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.