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Old 09-21-2020, 12:13 PM   #1
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Trailer bounce

I have a 267BHS that we tow with our F150 3.5EB. I haven't had any problems with towing or stability, but one thing I've noticed is that on certain stretches of road, usually concrete, that aren't quite as smooth, we start to get trailer "bounce". It doesn't ever feel like Im losing control but it can be uncomfortable in the truck and nauseating if it goes too long before we hit a smoother stretch of road.
Anybody ever experience this and find any good ways to minimize it?
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Old 09-21-2020, 12:34 PM   #2
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You need to drive at a different speed, so the oscilations are out of phase
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Old 09-21-2020, 12:39 PM   #3
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I have experienced what feels like a push/pull type of energy on some stretches of road. There's a stretch of highway where it goes on for miles. I figure it's the little lulls in the road that are spaced out just right to cause this motion. It would be like the TV is going up that lull just as the TT is going down, thus creating this stop/go, back/forth motion. I don't think the TT is bouncing, though.
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Old 09-21-2020, 12:40 PM   #4
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Originally Posted by dannyabear View Post
You need to drive at a different speed, so the oscilations are out of phase
I didn't think to vary the speed. I'll try that next time.
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Old 09-21-2020, 12:46 PM   #5
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We have that too on occasion. I pull a 264BHW with a F150 5.0 using a Husky Centerline WDH. Kinda feels like a boat in choppy water, I just slow down a little bit and it usually gets better. I've noticed using bags helps a little too and one of my next upgrades is going to be better shocks in the rear.
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Old 09-21-2020, 12:47 PM   #6
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Originally Posted by sturgissteele View Post
I have experienced what feels like a push/pull type of energy on some stretches of road. There's a stretch of highway where it goes on for miles. I figure it's the little lulls in the road that are spaced out just right to cause this motion. It would be like the TV is going up that lull just as the TT is going down, thus creating this stop/go, back/forth motion. I don't think the TT is bouncing, though.
Bouncing was the only way that I could think to describe it but the TT really isn't bouncing, its more at the hitch.
Trying to vary the speed is a good idea but not always feasible depending on traffic.
Im going to try rearranging all of my "stuff" inside the camper before our next trip. unfortunately, the largest storage compartment is at the rear of the camper so that where most of the "stuff" goes.
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Old 09-21-2020, 01:22 PM   #7
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I have the exact same experience under the same conditions. It is actually worse in my F250 than it was in my F150. I haven't found anything that settles it other than getting off that stretch of road. It does occur much ore frequently on cement vs. blactop.
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Old 09-21-2020, 01:47 PM   #8
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Originally Posted by wbigelow View Post
Bouncing was the only way that I could think to describe it but the TT really isn't bouncing, its more at the hitch.
Trying to vary the speed is a good idea but not always feasible depending on traffic.
Im going to try rearranging all of my "stuff" inside the camper before our next trip. unfortunately, the largest storage compartment is at the rear of the camper so that where most of the "stuff" goes.
Just be careful not to put too much weight too far back. That could lead to sway. Aim for 10-15% of TT weight to be on tongue.
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Old 09-21-2020, 01:48 PM   #9
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Originally Posted by Marcm157 View Post
I have the exact same experience under the same conditions. It is actually worse in my F250 than it was in my F150. I haven't found anything that settles it other than getting off that stretch of road. It does occur much ore frequently on cement vs. blactop.
Cement roads, that's where I noticed it the most, too.
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Old 09-21-2020, 02:03 PM   #10
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I sometimes just change lanes.

There was a stretch of I-90 that was so bad, that the DOT had a sign up, that said to drive in the left lane. That section of road was not to old, but they tore it out and replaced it a few years ago.
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Old 09-21-2020, 02:09 PM   #11
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Originally Posted by dannyabear View Post
You need to drive at a different speed, so the oscilations are out of phase
x2
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Old 09-21-2020, 03:22 PM   #12
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I'd recommend upgrading shocks, assuming they are stock now. Stock shocks just can't control the spring with the added weight on the rear axle.

Go for a quality mono-tube, gas charged, such as Bilstein or Fox.
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Old 09-21-2020, 03:34 PM   #13
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I have seen it on cement roads. It has to do with the cut spacing of the slabs and your wheel bases. I just slow down and or change lanes.
I have never had it happen on a black top road.
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Old 09-21-2020, 03:40 PM   #14
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Concrete expansion joints causes that "bounce bounce" thing when the distance between the joints and your wheel base is the same.
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Old 09-21-2020, 06:10 PM   #15
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Quote:
Originally Posted by wbigelow View Post
I have a 267BHS that we tow with our F150 3.5EB. I haven't had any problems with towing or stability, but one thing I've noticed is that on certain stretches of road, usually concrete, that aren't quite as smooth, we start to get trailer "bounce". It doesn't ever feel like Im losing control but it can be uncomfortable in the truck and nauseating if it goes too long before we hit a smoother stretch of road.
Anybody ever experience this and find any good ways to minimize it?
Our 2016 F150EB was doing the same thing, especially hitting the transitions to bridges. I had Bilstein shocks and struts installed, and it took that extra 'bounce' and porpoising out. It's much better than with the stock shocks. Not cheap, but they're the last shocks I'll have to put on it.
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Old 09-21-2020, 06:53 PM   #16
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I've got Bilstein 4600s on my 2wd F150, and the ride is improved, but I still get some bounce that just makes me think the back end is a bit spongy. I will be installing bags later this year to stiffen up the back end to help, and I think that will do the trick. I've experimented with shuffling loads around and it helps, but if you are closer to the 15% of tongue weight with that 267, you are going to experience more of a dynamic bounce condition because the spring rate on our F150s just isn't quite stiff enough to resist a good bounce. I'm still not ready for the 3/4 ton that everyone likes to point to because I'd like to keep my teeth in my head for the 90-95% of the time I'm driving unloaded. I'll report back in a few months after installing the bags. We're headed to Tennessee again later this year and I'll be able to do a good before and after comparison as we made the same trip this summer without them.
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Old 09-21-2020, 06:59 PM   #17
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I have the exact same experience under the same conditions. It is actually worse in my F250 than it was in my F150. I haven't found anything that settles it other than getting off that stretch of road. It does occur much ore frequently on cement vs. blactop.
I-81 from Hazleton to near the NY line is like that. My Ram 2500 just about knocks the fillings out of your teeth on that section of roadway while towing. My F150 is much better in that section of roadway.
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Old 09-21-2020, 07:19 PM   #18
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We have a similar experience on a certain stretch of road we travel to get to one of our favorite local campsites. It's a concrete road with expansion joints that are just the right space apart that we get an oscillation that causes a bounce when you're going 55~60 mph. I always ask my wife if she is wearing her sports bra when we hit that section of road . Anyway my guess is the only thing you can do to minimize the bouncing is as others have mentioned, vary the speed down to a speed varies the timing across the expansion joints to try and minimize the oscillation.
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Old 09-21-2020, 08:25 PM   #19
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Wow, that was the worst experience we had towing our first TT from Montana back to NJ last month. I figured it had to do with some sort of resonance between the cement expansion gaps and the truck/trailer. But I changed speed from 70 down to 50 (and in between) with no difference except a corresponding lowering of the vibration amplitude - nothing like I would have expected due to the changing of the impact frequency of the tires. Really unpleasant and I thought I might lose the trailer altogether. I really don't know how the hitch manages to hold on to it under those conditions.
Ps: towing a 212qb with a RAM 1500 with tow package.
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Old 09-21-2020, 08:27 PM   #20
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There’s a stretch of road here like that and it’s concrete also. It was such a nauseating ride that we don’t go that way anymore.
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