I agree with PhoneDude that a small residential refrigerator is a very good solution since you will be using it with shore power. In addition to having more cooling capacity, the residential type refrigerator will use less than half the electricity that the RV refrigerator uses. Just be sure there's room for air to circulate around the external cooling coils. You'll have to close off the original refrigerator's outside openings.
2011 Sunseeker 3100
1997 Pathfinder Toad