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Old 03-25-2019, 04:13 PM   #1
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Bounce/Porpoising Issue

Background: I have a 2015 Ram 3500 longbox Cummins with a B&W Turnover ball/Companion in it. I bought it when I a when I purchased a 40' toyhauler that was just too much RV for my old tow vehicle. Fast forward to 2018 and we traded the toyhauler in for a Rockwood Signature Ultra Light 8301WS which obviously has a much lighter pin weight.



Issue: One of things I noticed after towing it around last year was that I get a lot of forward/back/bucking/porpoising when towing this RV. Today I took my RAM into the RV dealership to have them check it out and see what the issue might be. They have my camper anyway for some warranty work I'm having done on it.


Results: They couldn't figure out what the issue might be. They hooked up the two and took them for a road test. It's doing the same to them. It's riding perfect (not too high or low) a doesn't seem to be too far back or forward. They hooked the RV up to one of their shop trucks and took it for a ride and it tows just fine. No bucking/porpoising/jerking whatever.


They said they were going to research it a bit more and gave me back my truck. One thing occurred to me on my way back to my office is that I had timbrens on my old 3/4 ton pickup that I transferred to my 1 ton in 2015. I'm not wondering if there is just enough weight on the pin to barely rest on the timbrens and any slight bump or motion causes it to bounce off the timbrens.

Unless someone else has any suggestions, I was thinking that once I get my RV back from the dealership (waiting on warranty parts) I'd pull the timbrens and seeing how it does.


Thanks in advance and I'm open to all suggestions on how to resolve this.
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Old 03-25-2019, 05:30 PM   #2
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Not sure about the timbrens but how old are your shocks?
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Old 03-26-2019, 08:32 AM   #3
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Quote:
Originally Posted by 2Evil4U View Post
Not sure about the timbrens but how old are your shocks?

it's a 2015 RAM so....4 years. 3 actually when I bought the Rockwood and noticed the bucking.
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Old 03-26-2019, 08:36 AM   #4
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I think you might be on to something with the Timbrens. I had a 97 F250 7.3L that had overloads on it. With a heavy enough load they would engage and work fine. But our TT had just enough TW to squat the truck down to where the overloads were just nearly engaged. Every bump would cause those overloads to hit the bracket and jar the heck out of you. Made for a horrid ride. Removed them and all was well.
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Old 03-27-2019, 06:54 AM   #5
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Quote:
Originally Posted by MontanaMike View Post
it's a 2015 RAM so....4 years. 3 actually when I bought the Rockwood and noticed the bucking.
The OEM shocks on my 14 ram 1500 were junk after 18 months. Changed to bilstein 5100 and was much happier.
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Old 03-27-2019, 07:11 AM   #6
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Had that on my 2013 Silverado. Air bags improved mine about 100%. Haven't needed them on my 2014 GMC 2500HD Duramax.
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Old 03-27-2019, 10:22 AM   #7
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Ok, you may have a couple of issues here that have different resolutions to your problems.

First; you may need new shocks sine these are the originals on the truck Correct? I replaced my shocks on my 2008, Dodge 2500 Mega Cab last April with Blistein 5100 series shocks. This will help with the ride control since the old shocks might be worn out. Since there is very little to no rebound control of the tire/wheel assembly in your suspension if they are worn out.

Second; the fore aft chucking could be caused by your hitch and pin box connection. Depending on style of hitch jaws and pin box there could be a very slight gap between the jaws and kingpin. This slop will allow the fore aft chucking to occur when you accelerate and stop. Or as you state "forward/back/bucking/proposing".

I had the fore aft chucking on my truck and trailer combination even with the TrailAir kingpin box installed on my trailer. When I replaced my hitch in the truck with the Demco Glide hitch the fore aft chucking went away. Why? the hitch jaws tightly engage the kingpin and there was no slop between the them. Another feature of the TrailAir pin box is the ability to decouple the trailer bounce from the truck making for an improve ride when towing.

Good luck and let us know what you did to resolve this issue.
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