Why does your boat trailer fishtail?

A boat trailer fishtails primarily due to improper weight distribution, where the load is either too heavy at the back or unevenly distributed. This can cause the trailer to sway, especially at higher speeds or during sudden maneuvers. Additionally, insufficient hitch weight or poor alignment between the trailer and tow vehicle can exacerbate the problem. Ensuring proper loading, maintaining adequate tongue weight, and driving cautiously can help prevent fishtailing.