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Open Roads Forum  >  Towing

 > porpoising????

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rode2nowhere

southern indiana

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Posted: 05/08/12 06:20pm Link  |  Print  |  Notify Moderator

So lets see, i was wrong and my receiver is round which makes it a weak and overloaded design, i need a heavier equalizer hitch, and new shocks and a new class v receiver hitch,,,,,dam!

RCMAN46

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Posted: 05/08/12 10:32pm Link  |  Print  |  Notify Moderator

rode2nowhere wrote:

So lets see, i was wrong and my receiver is round which makes it a weak and overloaded design, i need a heavier equalizer hitch, and new shocks and a new class v receiver hitch,,,,,dam!

I would not say you were wrong. You need to visit your local CAT scale or equal and get some real world weights with your current setup. Guessing and and spending money on things you may not need will not solve your problem. The trip to the scales should cost less than $20 if you do all the weighing the same afternoon. You need to weigh the truck. Weight the truck and trailer with and without the WD active. Make sure you get a number for each axle. A CAT scale will do three axles at a time. When in the final towing configuration I would recommend getting a weight on each trailer axle.

Wes Tausend

Bismarck, ND

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Posted: 05/11/12 07:55am Link  |  Print  |  Notify Moderator

...

The WD bars may be too light. You may be able to install heavier bars in the same hitch. While installing more washers to tilt the hitch head back will give you more initial tension, weak bars, with a heavier weight, will bend more like an old Buick suspension.

The extra bar travel has no damping (shock absorbers) like the truck springs and allows excessive movement. Stiffer WD springs will keep the WD travel to a minimum and make the truck springs do the work. At least they are damped if your shocks are functional yet.

Wes
...


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rode2nowhere

southern indiana

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Posted: 06/14/12 06:52pm Link  |  Print  |  Notify Moderator

Just an update, redid my equalizer hitch setup, it was off. But still bounces on dips, front of trailer and rear of truck bounce up and down pretty good. Also my equalizer is 10,000 lb., not 6000 like i thought,...now good shocks, new tires, and a 15000 lb curt hitch are in order....

christopherglenn

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Posted: 06/14/12 10:55pm Link  |  Print  |  Notify Moderator

If I had my WD loose (longer chain under tension), the truck and trailer tended to do that, tightened up it did it less. I would do the shocks and hitch, then see if that fixes it before getting tires. Not all tires are created equal, some make towing better, some worse.


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BenK

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Posted: 06/14/12 11:10pm Link  |  Print  |  Notify Moderator

rode2nowhere wrote:

Just an update, redid my equalizer hitch setup, it was off. But still bounces on dips, front of trailer and rear of truck bounce up and down pretty good. Also my equalizer is 10,000 lb., not 6000 like i thought,...now good shocks, new tires, and a 15000 lb curt hitch are in order....


Please keep this thread posted on how the new, traditional receiver
does.

The OEM GMT800 (your era pickup truck) receiver is a bad design, IMHO

It depends on transferring much of the WD Bar forces via the bumper,
why it is bolted to the bottom of the bumper...if your's is that era
receiver

Most have reported this and other ills of that GM receiver design
goes away after their switch to a traditional designed receiver


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rode2nowhere

southern indiana

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Posted: 06/15/12 04:11am Link  |  Print  |  Notify Moderator

fyi tires are worn out and due for replacement.

mkirsch

Rochester, NY

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Posted: 06/15/12 11:39am Link  |  Print  |  Notify Moderator

Tires won't cause porpoising.

Your problem is you don't have enough "spring action" at the joint between the truck and trailer. Classic signs of the factory receiver being overloaded and/or flexing.


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babar445

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Posted: 06/15/12 05:44pm Link  |  Print  |  Notify Moderator

I would bet you will see a big difference when you change out the reciever, I did on mine just about a week ago. My old hitch was clean, no rust, no cracks, but I could see it flex quite a bit when I pulled the bars up. The realization came when I was on my back under the truck zipping out the bolts with my impact wrench with one hand and holding the reciever with the other. When I took out the last bolt I had no problem laying the whole reciever over to the side with my one free arm. I'd say it must weigh somewhere in the mid 30lb range, and to think I've been towing TW of about 1150 lbs, no wonder it would porpose on the un-even roads. I was well with-in its labled weight range, I just dont know how it held up as well as it did after getting it off and looking over it. I had to use the floor jack to hold the Draw Tite hitch up there until I got the bolts started. It weighs nearly 70lbs, almost twice the weight of the OEM hitch!

rode2nowhere

southern indiana

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Posted: 06/15/12 07:57pm Link  |  Print  |  Notify Moderator

we will see....what hitch did you get?

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