There may be other reasons, but the extra axle will give you a little more length and much more cargo carrying capacity.
When Jayco made hybrids, the 17z was a sindle axle model, the 19h was the same trailer with double axles. With the extra length there was a double sink (instead of single) added on one side and a cabinet on the other. Otherwise it was exactly the same trailer, but the second axle added much more cargo carrying capacity. I don't remember the published spec, but I think it was around 900 lbs.
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2023 Micro Minnie 2108TB
2017 Toyota Tundra
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