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  1. #1
    Join Date
    Mar 2021
    Location
    Melbourne
    Posts
    3

    Default Widening a Boat Trailer

    I'm looking to widen a boat trailer by u-bolting a welded rectangular frame outside of the existing one as shown in the attached figure. The springs would then be relocated from the inner frame to the outer frame. The existing frame is 1200mm wide and the new frame would be around 1700mm and made from 50x50x3 RHS. Would there be any structural or other issues with this approach, or suggested improvements? Any feedback would be greatly appreciated.

    Cheers
    Blair
    Attached Images Attached Images

  2. #2
    Join Date
    Jun 2010
    Location
    Wimmera
    Posts
    89

    Default

    Once you add the mudguards etc., it is going to be a very wide arrangement.
    What is wrong with the width at the moment?

    John.

  3. #3
    Join Date
    Mar 2021
    Location
    Melbourne
    Posts
    3

    Default

    Quote Originally Posted by Wimmera Jack View Post
    Once you add the mudguards etc., it is going to be a very wide arrangement.
    What is wrong with the width at the moment?

    John.
    Thanks Jack, good question.

    The extra width for the guards will be 470mm (235mm x 2) so the total width including guards will be 2170mm which is slightly less than that of Jayco's camper trailers (2240mm) . The reason for widening is that it will be used for a folding trimaran which has a total width of 2500mm. I've attached a photo on the existing trailer. Widening the trailer will reduce the side overhang and provide greater stability on the highway. Cheers
    Attached Images Attached Images

  4. #4
    Join Date
    Jan 2004
    Location
    Mackay North Qld
    Posts
    5,613

    Default

    Hi Blair 62,

    Welcome to the Metalwork Forums,

    We have some fine folks here who are supportive friendly and helpful.

    Please take the time to navigate around the forums to view the varied and interesting subjects.

    To do this, goto the the FORUM box in the top left hand corner of the screen. Click Forum Home and a scroll down page will come up.

    Scroll down the page and the various help pages and sub forums shall be shown.

    Please read the Terms of Use on the very top of the scroll down page - they are our rules.
    To save time heres the link
    https://metalworkforums.com/f90/t197...terms-tou-read

    Many pages also have a sticky at the top.If you post its always a good idea to check the sticky ,if there is one there.


    As far as the trailer mods are concerned I would advise on perusing the sticky at the very top of this Trailer and other Fabricated stuff Forum-

    VSB1 v5 - Trailer building Regulations

    Again, welcome to our forums.

    Grahame

  5. #5
    Join Date
    May 2013
    Location
    Rockhampton, QLD
    Age
    65
    Posts
    368

    Default

    Welcome to the forum.

  6. #6
    Join Date
    May 2011
    Location
    Murray Bridge S Aust.
    Age
    68
    Posts
    4,809

    Default

    Hi Blair and Welcome to a TOP FORUM.
    In regards to your thoughts on adding to the sub frame, I'd probably go for 50 X 50 X 4mm rather than the 3mm. Also I'd make a new separate frame, rather than welding it next to the existing frame, as water will get between the 2 edges and rust, requiring major work again. If you do go down this path, make sure that you have holes at least 15mm in the bottoms to allow water to drain out.
    HTH
    Kryn
    To grow old is mandatory, growing up is optional.

  7. #7
    Join Date
    Aug 2010
    Location
    Soldiers Point, NSW
    Age
    57
    Posts
    4

    Default

    Hi Blair

    Are you getting the new frame hot dipped? If so make sure the new frame is properly vented (ie min 12mm holes drilled in right places). I only asked because your existing trailer is gal.

    Regards
    Twosheds

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