What is Difference Between Overslung and Underslung Trailer Coupler

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Question:

What is the difference between overslung and underslung?

asked by: Mike P

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Expert Reply:

An underslung trailer coupler is one that attaches to the bottom of the trailer frame and an overslung one is one that attaches to the top of the frame.

The Replacement Head for Blue Ox SwayPro Weight Distribution Systems part # BXW4011 is for trailers with an overslung mounted trailer coupler like part # CA-5400-B whereas the Replacement Head for Blue Ox SwayPro Weight Distribution Systems part # BXW4012 is for trailers with an underslung mounted trailer coupler like part # CA-5335-B.

expert reply by: Jameson C

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Answer 1

Hello Ed, Thanks for writing in! You were right on the money with the Replacement Spring Bars for Blue Ox SwayPro Weight Distribution System #BXW4007. I would definitely step down from your current 1,500-lb bars for the new trailer. Your trailer has…

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Answer 2

An underslung trailer coupler is one that attaches to the bottom of the trailer frame and an overslung one is one that attaches to the top of the frame. Measuring is not required if you just take a look at your coupler and see where it attaches to…

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Answer 3

They are not Josh. The Replacement Spring Bars item #BXW4008 are only going to fit the newer SwayPro systems. You'll need to replace the head on your SwayPro as well, which we do not have. I attached a couple of pictures below that break down the…

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Answer 4

I recommend selecting one of our Equal-i-zer weight distribution hitches. Equal-i-zer has earned the reputation of being one of the best systems available with their excellent quality and durability to last. You will need to select one of the hitch…

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Answer 5

To choose a weight distribution system you will need to go by the total tongue weight of the set up. This is calculated by taking the tongue weight of the trailer, when loaded and ready to tow, and adding to that the weight of anything loaded behind…

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Answer 6

Hey Anthony, you’re absolutely on the right track thinking about the wheel along with the tire here because once you get into a 12 ply rated tire (typically load range F) the pressure and load demands go up quite a bit and that’s where mismatches can…

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Answer 7

If a trailer tire and wheel each have different weight capacities then the lower-rated item of the two determines the overall capacity of the combination. You can certainly run a tire with a lower or higher weight rating than the wheel its used on…

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Answer 8

It sounds like you might be getting some bleed-over from the turn signals occurring in the trailer connector. Take a look at the trailer connector, and check the plug for corrosion in the sockets. If you see any green or white corrosion in the…

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Answer 9

Hey Dustin, according to B and W the Continuum part #BW28FR can be used on taller frames like your 8 inch frame but you would just need to supply your own cylinder mounting hardware that is taller. So basically what that means is you'd need…

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Answer 10

Hello Gary, thanks for reaching out. The B&W Continuum Weight Distribution System #BW28FR does fit an A-frame tongue, but if your tongue has a straight bar down the middle that would be an obstruction for the WD system so it will not work. A…

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Answer 11

Hello Danny, I’m really glad you mentioned the Equalizer! When sway is the issue, that one and the Weigh Safe are definitely my go-to options. They both have 4 point sway control, with straight spring bars and frame brackets. They can be a little…

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Answer 12

When it comes to weight distribution, tongue weight is the most important factor. It looks like you are ahead of the game and accounted for that with each of these systems, great job. I would still recommend finding your actual tongue weight once…

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What is Difference Between Overslung and Underslung Trailer Coupler

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