1: Campers don’t need to look pretty.
2: They also are unpowered and don’t need the additional traction to put power to a road that a car needs.
3: weight carrying capacity and tire diameter aren’t 100% correlated.
4: tires that are smaller than the towing vehicle means that the frame geometry can be simpler and still allow for a level trailer when loaded.
5: smaller tires are cheaper
Lots of other reasons as well but those are the main 5 I can come up with.
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