Will Heavier Spring Bars Decrease Trailer Porpoising

Question

Question:

We have the Sway Pro with 750 pound bars and are experiencing some porpoising. Our tongue weight is about 660 pounds, and we dont put much behind the rear axle besides the Sway Pro which is about 70 pounds. Would moving up to the 1,000 lb. bars help with the porpoising or would it make the ride unnecessarily rough?

asked by: Chris

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Expert Reply:

If the trailer does not have enough weight on the tongue relative to the weight of the trailer (ideally between 10-15%) then you can experience issues with porpoising. A weight distribution system will generally fix most porpoising issues as it helps better distribute the load more evenly but if the springs bars are too weak they can flex more and give in to porpoising. The best solution would be to rearrange weight on the trailer but stiffer springs bars would also help to alleviate some of the porpoising issues. This however comes at a cost as heavier rated spring bars will ride stiffer but I don't think 1,000 lb spring bars on a trailer with 600-700 lb tongue weight is too much.

The Replacement Spring Bars for Blue Ox SwayPro Weight Distribution System part # BXW4007 are the correct 1,000 lb spring bars for the Blue Ox SwayPro Weight Distribution System but I have attached all our entire spring bar options below as well.

expert reply by: Conner L

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Answer 1

The correct Blue Ox SwayPro Weight Distribution System for a 2023 Airstream Flying Cloud 23FB is part #BXW0756. This system is rated up to 750 lbs of tongue weight. I show the unloaded tongue weight of this trailer to be 500 lbs. The tongue weight…

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Answer 2

The complete installation instructions for the Reese Strait-Line Weight Distribution Hitch #RP66074 are attached for your reference. While these do provide complete adjustment instructions for the hitch head angle the chart you referred to (from page…

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Answer 3

I have linked the instrucitons for Reese Strait-Line weight distribution #RP66082 to the right. I have also linked the instructions for the dual-cam sway control portion. The instructions do cover everything including where the brackets need to go on…

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Answer 4

First, when calculating tongue weight, after you have the tongue weight of the trailer, loaded and ready to tow, you then have to add to that the weight of anything you are carrying behind the rear axle of the tow vehicle. If you have 200 pounds of…

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Answer 5

Your weight estimate will be close but probably a bit higher than the 700lb. Of course this is completely dependent on how you load your camper but the largest storage area is the front as well as the bedroom closets and under-bed storage. The Reese…

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Answer 6

Yes I can. The bolts that hold the head to the shank in Strait-Line Weight Distribution System, #RP66074, will need to be torqued to 300 foot pounds. The installation instructions state that if a proper torque wrench is not available, torque them to…

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Answer 7

I would recommend using the Replacement Spring Bars for Blue Ox SwayPro #BXW4008 1,000-1,500 tongue weight bars. If you're already seeing close to 1000lbs of tongue weight as it is, I would only imagine when traveling that number will start to…

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Answer 8

The Timbren Springs #T28MR has an overall height of 5-11/16". With your 2021 GMC AT4 having the factory lift you will want to measure the distance from inside the cup on your current jounce bumper to the pad on the axle. We do have a 1"…

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Answer 9

Porpoising (bouncing like you described) and sway are both commonly caused by the same thing when towing and that is not enough tongue weight for the trailer relative to the total amount of weight the trailer weighs. You need the tongue weight to be…

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Answer 10

Yes, it does. The Spacer Kit for Timbren Suspension item #T68MR will work with the Severe Service Timbren Suspension Enhancement System item #TFRTT350J. This system is confirmed to fit the 2023 Ford F-250. It already includes a pair of 1"…

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Answer 11

Most of the time when a tow setup is porpoising with a weight distribution system all you have to do is add a bit more spring bar tension to minimize the porpoising. With an Equalizer system you would need to angle the spring bars down further to add…

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Answer 12

I do have an option for you but SuperSprings does not offer any additional spacers for the SumoSprings Trailer Helper Springs part #SS26MV. That said, we do still have spacers that will work for this, the Timbren Spacer part #A25723-90AH00 for…

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Will Heavier Spring Bars Decrease Trailer Porpoising

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