Bushwacker had a single axle trailer under his 20' Seafari and he had no issues with it. I think he went up to 15" wheels and a heavier axle. Not positive. A single 3500# axle and 14" "D" rated tires should be fine for local use, however if you are going to tow your boat for long distances a 6000# dual axle would be the way to go!! Good luck.
Where you located?
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