I've not done anything with the fridge vents. It hasn't been a problem so far but I may give some thought to putting some screen behind them.
If your area is prone to mud daubers / wasps, put a rag or something to block the opening in the water access door, where the hose connects. Last summer I opened that door after a month and found a mud dauber nest. It's mostly gone now but there is some mud I still can't get out of there.
Also, spray a house type insect repellant into the pinbox. Mud Daubers like to get up into the insulation in the nose to build a nest. At the Keystone service center they showed me that on one they had the nose cap off.
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