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  1. #1

    Default Tandem Trailer Shaking

    Hi All,

    I have a 17ft Fibreglass Boat on a tandem trailer. At the weekend I noticed at certain speeds (80-90kph and also at approx 105kph) the sides of the trailer seem to rapidly shake up and down by approx 7cm. The shaking seems to be cntered just infrom of the wheels at the point where the trailer starts to angle inwards. I am concerned that the trailer or boat may become damaged. (although the boat does no move at all with the shaking).


    Could it be that the wheels need balanced (I can only see the from pair from my driving position) as they almost seem to bounce on the road with the shaking? Or tyre pressures? Any advice would be welcomed.


    Thanks
    Donald

  2. #2
    Join Date
    Sep 2006
    Location
    Baton rouge, La, USA
    Posts
    1,256

    Default Re: Tandem Trailer Shaking

    look at your tires for scalloping(for lack of a better word)....uneven wear on the face of the tire....i added trim tabs on a boat about that size once and moved the boat aft on the trailer approx 8 inches...i ruined a set of tires in 150 miles...i run balanced trailer tires btw....

  3. #3
    Join Date
    Sep 2008
    Location
    Maryland - USA
    Posts
    5,487

    Default Re: Tandem Trailer Shaking

    Also, check to make sure the boat is positioned correctly on the trailer...typically, the OEM recommends ~ 10% of the total weight shows up at the tongue (at the trailer's tow point).

  4. #4
    Join Date
    Dec 2006
    Location
    Chaumont Bay, N.y., USA
    Posts
    4,029

    Default Re: Tandem Trailer Shaking

    Ayuh,... Sounds like square tires for sure,....

    Outa balance, worn, outa alignment,..??
    Any Grease is Better,... Than No grease at All....

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