Ice forming on fridge "fins"

You don't state the year, make, or, model of the fridge you reference, but, if it's a typical RV gas/electric refrigerator, this is a common problem as mentioned previously. Opening the door less, raising the interior temperature, and occasionally defrosting the system will remove the ice. The ice won't hurt anything but the system will be less efficient and use more propane until it is defrosted. The available freezer space tends to "shrink" a little when it's coated inside with ice.

A few minutes reading the owners manual will explain the manual defrost cycle.

Chum lee