Truck And Trailer Are Porpoising - Is This Because My Spring Bars Are Under-Rated?

Question

Question:

Tow with 01 GMC Sierra 1500 5.3. Trailer 2018 irest river vibe 251rks extreme lite. Approx 5500 dry weight. I bought blue ox weight distrubition hitch. Trailer and truck is propipoising. Will a away bar too light cause this if so can i upgrade to heavier bars.

asked by: Earl E

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Expert Reply:

Hello Earl. The porpoising you mentioned is rare when using a weight distribution hitch, but if the bars are under-rated it could cause this kind of issue. I am not sure which Blue Ox system you are using currently, but if you have the Blue Ox TrackPro hitch, I recommend using the 800 lb Spring Bars # BLU25FR.

If you have a different Blue Ox system, just let me know what you have and I am happy to make a recommendation.

Porpoising is generally the caused when you do not have enough tongue weight relative to the gross weight of the trailer (ideally between 10% and 15%). A weight distribution hitch will typically fix this, but you can also try rearranging things inside the trailer to try to increase the tongue weight.

expert reply by: Jesse M

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Answer 1

Yes, you should swap the weight distribution bars to the 1,000-lb Spring Bars for Blue Ox TrackPro #BLU52FR. These have a tongue weight capacity of 800-1000lbs. It is important to use the correct bars with the TrackPro since the sway control and…

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Answer 2

The Blue Ox Track Pro 7 Hole Shank #BLU28FR can be used with systems with a tongue weight up to 1,300 pounds. Upgrading the bars to a capacity more suitable for your needs would require the Replacement 1,000 pound Track Pro Bars #BLU52FR. These are…

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Answer 3

I never recommend a weight distribution hitch that is under weight. If you choose to go with either the 800LB Blue Ox TrackPro #BLU47FR or 1,000LB Blue Ox TrackPro #BLU77FR I recommend getting a spare set of weight bars in the other weight class.…

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Answer 4

Yes, you can use the Replacement 1,000-lb Spring Bars for Blue Ox TrackPro Weight Distribution System #BLU52FR with the Blue Ox TrackPro Weight Distribution w/ Sway Control #BLU27FR.

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Answer 5

I do have a recommendation so that you will not have to have separate hitches as the Blue Ox SwayPro Weight Distribution #BXW1503 hitch head is specific for underslung only couplers. I recommend getting the Blue Ox TrackPro Weight Distribution…

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Answer 6

As long as the Spring Bars #BLU52FR lay flat on the L-Brackets #BLU72QR for your Blue Ox Track Pro weight distribution you are okay to use the brackets pitched slightly forward. The only issue would be if the spring bar is only touching the edge off…

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Answer 7

Weight distribution hitches like the Blue Ox TrackPro all typically have a tongue weight range that they're designed to handle and going too far above or below that range with hinder the performance of the hitch. In the 900lb tongue weight range…

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Answer 8

When using the Blue Ox TrackPro Weight Distribution w/ Sway Control - 7-Hole Shank - 13K GTW, 1.3K TW #BLU27FR with your smaller 800-pound tongue weight trailer, it will be a super stiff and uncomfortable ride. For this reason and due to the tongue…

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Answer 9

Since your tongue weight is 955 lbs the spring bar replacements you'd want for your Blue Ox TrackPro is the part #BLU52FR. If your loaded tongue weight is going to be over 1,000 lbs though you'd want to go with the part #BLU32FR instead as…

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Answer 10

The most important factor when it comes to choosing a weight distribution hitch is going to be your tongue weight. Ideally you want your tongue weight to fall somewhere in the middle of your WDH range. Tongue weight is going to be 10-15% of your…

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Answer 11

An improperly loaded trailer can definitely contribute to porpoising. Tongue weight on your travel trailer should be 10-15% of the loaded trailer weight. You can find this by picking up a scale like #e99044 or you can use one of the other methods…

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Answer 12

On the Blue Ox Weight Distribution System item #BLU66FR the 29" inch measurement point is the center of the bracket. There is some margin for the placement of the bracket because of the chains holding the torsion bars. However, there has to be…

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Truck And Trailer Are Porpoising - Is This Because My Spring Bars Are Under-Rated?

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