If the fridge is leaking current to ground, the correct solution is to fix the leakage (by replacing the element), not to ignore it and plug it into a non-GFCI outlet. This is a potential electrical hazzard; if you are plugged in somewhere with a bad or broken ground connection, you are creating a hot skin condition on the RV. You'll also have trouble any time you try to plug the RV into a power source protected by a GFCI, such as a standard 15/20A outdoor outlet which per code must be GFCI protected.
I'm a bit surprised at the number of people suggeting you ignore the problem. I don't think the same people would say to ignore a tiny propane or gasoline leak...and while the two aren't entirely the same, there are some similarities between them and a mains voltage leak.