New trailer build

Boat trailers and trailering

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New trailer build

Post by dbug10 » Sat Apr 15, 2017 4:07 pm

Ok I am a newbie to this site and might I say it is an amazing and very informative site. I have a question about building a new trailer for my STV fiberglass 19' 3 sponson tunnel drag boat. The trailer it sits on now is a single axle C channel frame and I am wanting to build a tandem axle rectangular tube trailer and my question is this what size tubing should I use ? The current trailer is 1.5" x 4" C channel and I dont know if I shoud go with 2 x 3 or 2 x 4 tubing ? the boat is pretty light the hull all its contents and the outboard are between 950 and 1100lbs. I really think 2 x 3 x .125 would probably be what I would need but I am not 100% sure and would like some input from others so if anyone can give me some advice please do so

James Sanderson

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Re: New trailer build

Post by hoodman » Sun Apr 16, 2017 5:52 am

I would get the book if I were you. Then maybe see if there is a trailer design in the catalog that will suit you. ... fo/12-432/

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Re: New trailer build

Post by Nova SS » Sun Apr 16, 2017 7:50 am

Yes Glen-l has several different trailer sizes you can choose from I am sure one of them will be perfect for your boat.

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Re: New trailer build

Post by rleete » Sun Apr 16, 2017 8:20 am

At 1/8" wall, 2x3 would be plenty strong enough.

I just designed a waste water tank stand for work, and used 2x2 tubing with .090 wall thickness. That tank holds over 500 gallons.

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Bill Edmundson
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Re: New trailer build

Post by Bill Edmundson » Sun Apr 16, 2017 9:10 am

Are you looking at aluminum or steel? If I was home I could compare the choices. For a tandem trailer you will need very light springs.

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Re: New trailer build

Post by TAB » Mon Apr 17, 2017 3:12 pm

personally I would go with 4.

you will find that a lot of stuff is made too go on 4" c channel. so things like tire holders and jacks can be installed easily.

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Re: New trailer build

Post by Jester97 » Thu Jul 26, 2018 5:30 am

Any update on this build?

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