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Old 04-17-2020, 02:21 PM
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The city wants me to add six feet on to the tongue of this trailer and add a bunk behind the hitch so they can carry thirty foot culverts. the tongue is already ten feet long and only 1/8" wall and the bed is six feet long. I can do just about anything I want with it with approval. I was thinking of adding three feet to the front and back but would have to figure out a bunk on the tongue or add six feet to the back Anyone have any ideas??
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Old 04-17-2020, 04:17 PM
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I would set up a pipe with another pipe (or sq tubing) sliding inside so the hitch will telescope.
If people must jacknife and bend the pole, well the inner pipe with the hitch on it would be replaceable.
Same for the bunks at the back. Slide out and put the lock pin in.
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Old 04-17-2020, 04:39 PM
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They want a bunk close to the hitch
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Old 04-17-2020, 04:54 PM
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So have the telescoping section just behind the bunk.

Pole trailers are built that way for utility companies.


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Old 04-17-2020, 05:05 PM
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I would add the 6' to the back and keep the tongue as is since the load would be much better balanced when you add a bunk behind the tongue.
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Old 04-17-2020, 05:25 PM
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How heavy are the culverts on average ? It seems like your about at the limit for 1/8" wall tube now.
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Old 04-17-2020, 05:45 PM
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The problem with adding to the back, when turning that is going to have a heck of swing at the tail end. I would agree with the telescoping tongue, front bunk and second bunk meet together when the tongue is slid together (short).
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Old 04-17-2020, 06:06 PM
JBFab JBFab is offline
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If it were me, I'd propose (3) 7ish foot long sections of tongue. Each fabricated as a 3 chorded triangular truss. 1 section would have the tongue and jack mounted to it, the other two would just pin to each other. Finally, a base fixture attached to the front of the trailer (after cutting off the existing tongue).

Each section could have bolt tabs welded to the top chord to accept bolt on bunks to hold culverts (of whatever shape required).

Also, each section can be wired with a male plug on the front, female on the back for lights. You can use one piece of tongue, 2, or all three depending on how long of a culvert (or whatever) you are hauling.
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Old 04-18-2020, 01:18 PM
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Quote:
Originally Posted by JBFab View Post
If it were me, I'd propose (3) 7ish foot long sections of tongue. Each fabricated as a 3 chorded triangular truss. 1 section would have the tongue and jack mounted to it, the other two would just pin to each other. Finally, a base fixture attached to the front of the trailer (after cutting off the existing tongue).

Each section could have bolt tabs welded to the top chord to accept bolt on bunks to hold culverts (of whatever shape required).

Also, each section can be wired with a male plug on the front, female on the back for lights. You can use one piece of tongue, 2, or all three depending on how long of a culvert (or whatever) you are hauling.
If I did go the truss route what would you use for materials?
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Old 04-18-2020, 02:59 PM
JBFab JBFab is offline
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It depends what is easily available to you I guess. If it were me, I'd probably be going with 1"x.120" tube and 3/8 round bar.
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