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I have a new flatbed trailer that uses a square tube tow bar instead of a round like my kid trailer has. Since I'm setup on the Burley system, I need to use a flex connector for the new trailer. I bought one of each with the trailer so I was prepared when it showed up. While looking at them either one will fit but the square tube connector has ridges which are just as round as the rest of the connector. Other than increasing the diameter of the connector, does the ridges really matter, or can I use either one on this trailer?

I'm sure I get no support from Burley since both trailers are not Burley and the packaging for the connectors clearly state not to use them on other trailers.

My kid trailer is a Pacific Voyager II and the new one I bought is a Aosom/Mwave/somebody "wonderer" flatbed.

Flex connector for round towbar: Flex connect for round towbar from Burley site

Flex connector for square towbar: Flex connect for square towbar from Burley site

Here is the side-by-side photo of the connectors I received: Flex connector compare

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Can you include pictures? I'm pretty sure I know what you're talking about, though. – WTHarper May 22 '14 at 17:14
    
@WTHarper I added the images from Burley's website. Is this what you are looking for or do you need more? If you need more I can take some photos of the exact ones I bought that could show other angles. – BPugh May 22 '14 at 18:11
    
Looks like I don't get a say which way to go on this one. I tried to use the square tube connector on my trailer but it is too big to fit. However the round tube connector fit just fine. I'm wondering if Burley uses different dimensions on their tube stock between round and square tubing. – BPugh May 23 '14 at 12:11
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About a year ago you said "When I get more miles on it I'll post an answer." Can you tell us how your bike trailer hitch went? Did you get the square burley one installed and was it any better? Its totally OK to answer your own question and accept it, this closure will make future web searchers happy. – Criggie Jan 4 at 8:04
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@Criggie It works great. Maybe a bit rattly, but the whole trailer is that way. I posted an answer with the experience. – BPugh Jan 4 at 13:51
up vote 5 down vote accepted

These trailer hitches are interchangeable and I have no issues. I'm using the round connector in the square tube since it physically fits. I have put some miles on it on it hauling kids bikes, pulling kids in sleds (recommended to keep the rope out of the tire and carry a spotter), and a 90 mile weekend camping trip. I have had no issues with it.

As a bonus here I took a round connector out of another trailer that really has some miles and years on and put it on a new trailer (Trek branded Chariot). The tongue was squared tubed and too small for the connector but I was able to take a stone grinding wheel to the connector and re-size and shape to get it to fit. No issues found in it at all.

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