There are a few reasons. One is cost savings. On cheaper trailers, you’d have to upgrade the axles to handle the extra stress. Another issue is increased resistance. You want to conserve as much energy as possibly. Bigger tires can make your tow vehicle work much harder. A third reason is the extra height from the tires can change the entire geometry of the trailer. It isn’t as big of a deal now, because trucks come with massive tires, but hitch height used to be more standard and also lower.
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