Originally Posted by Nicholas
if im just putting a small fridge the same size as the ice box (just big enough to hold like 12 cans) would i still need to upgrade the converter? and i would still add ventilation
You'll have to check the manufacturers specs for installation clearances, ventilation and amp draw. We owned an electric dorm fridge that we would take cabin camping - it ran suprisingly hot and had plastic shunts that held it away from the wall. They typically aren't designed to be "built-in". It would also be useful for you to know the amp draw of any other appliances you plan to take - or that your TT is equipped with (A/C, Electric Griddle, etc) and compare it to your TT service breaker.
EDIT - Re-visited your pictures....doesn't look like you have A/C option. Existing 110V should be fine....but still a good idea to check the specs (amp draw) of the aftermarket fridge beforehand.