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How to calculate how much space on bed to avoid trailer hitting?


jeffw

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I'm in the midst of putting some storage onto our flat bed and I'd like to ensure the trailer doesn't hit the bins when turning very sharply.

 

At some point in the forum I had seen a drawing or formula to calculate how much space you'd need, but now I can't find it.

 

Any hints?

 

Thanks!

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I generally consider 56" as the minimum - but that is a generalization. You can calculate it on a particular trailer by measuring from the kingpin the the corner and measure the most outward part of the trailer at the corner. Some trailers curve out above the corner. In a dipping turn that is a concern.

 

In general the 56-58" does fine, but I have seen trailers that needed more for an extreme dipping turn. But that is on CAD, and not likely to be encountered in the real world. Some use 60" just to be sure.

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Measure the radius from the pin to the corners of the trailer. Confirm this is the max radius - in other words the equipment on the front of the trailer does not extend farther from the pin than the corners to the pin measurement.

 

Make a stick with a 2" something on the end that will sit in your 5th wheel jaws. Mark the stick with the radius of the trailer and then mark the arc on your deck with a bit of chalk. Place deck stuff at least 8 to 10 inches outside this arc. Plus add clearance as necessary for walking between the trailer and the boxes etc.

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