Extending/building a hay wagon

Hi folks, I'm going to purchase a 12ton running gear (tandem), here's some pictures:

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It currently measures 12' from axle to axle, and I wanted to make a 24' wagon out of it. So the stringers would each be 24'. I would have to extend the reach to get to this length. Is there a problem running this kind of a span with bending or flexing? All the other wagons seem to do it.

I'd likely be using I-beams or 8-12" rectangular metal beams for the stringers. What is best? I'd prefer not to use wood.

This is my first time building a wagon and I want to do it right. It will be for round bales.
 
There are two wagons like that on Lexington, Ky. Craigs List now 40 ft. steel flats, now thats a load of anything!
 
Make it easy on your pocket book and yourself by buying an old truck frame.

Lay some 3" channels across the top of truck frame and your done.

I built a 20 footer that way. I haul 8 bales on it with a 8 ton single rear axle gear.

12 ton is no problem for the truck frame and will take the twisting of the rough ground.

You would only need to extend your reach 2 or 3 feet to get 3 foot hanging over the front and 6 or so over the back. You want more over the back to get 2/3 of the load on the rear axles.

I'll get a picture if you would like.

Gary
 
I see trailers using composite decking material.Expensive but rot and the slipperyness of wood decking is gone.The deck will be flexible on rough ground.One company uses expanded metal for wagon floors.
 
This might be something to look at, look around you and see if there are any truck beds for sale. Might be cheaper than building one. I have made several 16ft hay wagons this way for less than $300 each. Bandit
 
I'll post a photo of the shop-built one my neighbor built for me out of old corn cultivators if you want. Mine is only on a 6 ton gear though, so it only has 6 places for 6ft bales, but it can handle stacking 3 more on top if the hay is light.

I used one built on a tandem like this when I bought some hay a couple of years ago. It had 8 places for 6ft bales, then you could put 3 more on top. It worked pretty well.

Don't worry about bend in flex. Build the bale holder strong so it doesn't flex and attach it to the gear with chains that give it several inches of free travel from the gear so the gear doesn't twist when one wheel goes in a hole or something.
 

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