OT Gooseneck trailer

avant 1735 · May 19, 2018

I have a dual tandem axel trailer. I am considering putting another dual axel under it. I have searched for formulas to determine axel placement. What I have found for a triple axel is the centerline of the middle axel is to placed at 60% of the length of the trailer. Is this correct? I have only found this formula once all other formulas talk about tandem axles. I know this will be a lot of work and I have not decided yet, but I am looking in to it. Thanks

jon f mn · May 19, 2018

60% is generally for bumper trailers. Goosenecks are generally at 70% or more depending on tow vehicle. Adding an extra axle requires more than just adding an axle. Are you sure your frame is strong enough to handle the extra weight? You will also need to upgrade the crossmembers between the main rails to handle the extra twist from the longer wheel base. There will be other things as well.

jon f mn · May 19, 2018

All so, the centerline of the axles is the middle of the span, regardless of how many axles unless they do not equalize.

ss55 · May 19, 2018

If your trailer is in fairly good condition, you can probably sell your old trailer privately and buy a new one that meets your needs for less than the cost to make a lot of modifications.

Ken Macfarlane · May 19, 2018

Depends where you want to put the load on the trailer.

redih55 · May 20, 2018

If you already have a tandemn dual gooseneck trailer, why would you want to put a third axle under it?
I have a tandemn dual gooseneck flatbed and I can haul up to 20,000 if I need to. Are you planning to
haul a heavier weight? I agree with the one post, sell your trailer and look for a new one that already
has triple axles.

1948CaseVAI · May 20, 2018

My first stop would be at my insurance agency.

Your whole trailer frame was engineered for one thing and now you want to just increase the capacity dramatically? Not even considering welding skills, you will be a huge liability going down the road unless you get a licensed engineer to sign off on your plan if you are planning to increase your load. And if not going to increase the load then what is the point?

ss55 · May 21, 2018

In some states, if you modify a trailer or repair a wrecked trailer it needs to be re-inspected and registered as a "Homemade trailer". That usually does not hurt the value of small older two wheel utility trailers, but could hurt the resale value of a larger newer trailer (Kinda like modifying a ladder or repairing a busted ladder). Check with your state's DOT.

OT Gooseneck trailer

avant 1735

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jon f mn

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jon f mn

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ss55

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Ken Macfarlane

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redih55

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1948CaseVAI

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ss55

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