No. Swamp coolers are not the same as absorption refrigeration.
Swamp coolers when used in dry climates (think desert-like) can cool a house effectively, but would not get cold enough to function as a refrigerator and especially a freezer.
RVs either have absorption refrigerators (traditional RV propane fridge) or more recently residential-type that use a compressor, and thus are electric only. These two are very different, but neither has much in common with swamp/evaporative coolers.
For what it’s worth, the problem described in this thread with absorption refrigeration is but one reason I think RV absorption fridges will be replaced with electric-only compressor refrigerators that work just like the ones at home.
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