Plugged into the truck while on shore (or genny) power might do it. Not sure why the fridge on 12v when on shore power is blowing fuses.
I accidentally left my A126 fridge in 12v last weekend and the only issue was I heard the converter fan from time to time. Didn't discover my error until hitching up and going to switch to 12v before hitting the road.
2011 FR Rockwood Premiere A126 Hard Side
TV=2011 Jeep Wrangler Sahara 2 Dr
Reese 66065 WDH, Curt WDH Shank #17120
Prodigy P2 Brake Controller, Mopar 7-pin Harness
B&M Transmission Cooler (#70268)