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Open Roads Forum  >  Fifth-Wheels

 > Trailer sway issies

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fowlthing

Roger, AR

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Posted: 09/03/22 08:27am Link  |  Quote  |  Print  |  Notify Moderator

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Posted: 09/03/22 08:26am Link | Quote | Edit | Print | Notify Moderator
2020 Model. Pulling with 2021 Ram 2500 Diesel. Have 3000 miles plus with no issues.

Now at speeds as low as 30 mph can hit a bump and side to side rocking translates into trailer sway. Worse going uphill. Had a trip this weekend and put two new tires on the rear axle. My tire shop only had two.

Is this axles out of alignment?? Shocks on the truck? ( 30k miles on truck).

I pulled the tires off and bearings are good. Measured and axles are same distance between tires. Did not measure to the pin.

Tread is still good on front axle. And was good on the two that were replaced. Wear is even. Could not detect that they were out of round when jacked up and spun the wheels.

Any help is welcome. Have years experience of towing trailers. The sway is dangerous. Not a slight annoyance. Thanks.

ssthrd

Vancouver Island

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Posted: 09/03/22 09:05am Link  |  Quote  |  Print  |  Notify Moderator

Dumb question maybe, but are your hitch bolts tight?


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fowlthing

Roger, AR

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Posted: 09/03/22 09:27am Link  |  Quote  |  Print  |  Notify Moderator

Not a dumb question. We just checked them and all tight.

Measured from axle to the pin and they are the same distance.


2017 Ford 350 SRW
Grand Design Solitude 375RES
may switch to a Ram

ssthrd

Vancouver Island

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Posted: 09/03/22 09:53am Link  |  Quote  |  Print  |  Notify Moderator

Looks like you have checked out the trailer, but what about the truck? On a vehicle as new as yours with few miles, it would seem to be unlikely that there would be a suspension problem. But ya never know. That would be my next step.

If you can find an empty parking lot somewhere, maybe you can put the truck through some slalom type turns at a speed that would challenge the suspension and see what happens.

Have you scaled your rig? Maybe you have too much weight to the rear.

That’s all I got…………..

bgum

South Louisiana

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Posted: 09/03/22 10:31am Link  |  Quote  |  Print  |  Notify Moderator

Check all tire pressures truck and trailer. Is the two new tires the same size and grade ( C D E F)as the front two?

* This post was edited 09/03/22 11:06am by bgum *

MFL

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Posted: 09/03/22 11:14am Link  |  Quote  |  Print  |  Notify Moderator

That is a big FW, may be close to 4K pin wt when loaded. A bit much for the 2500 with softer springs than your F350 had.

You likely do need some suspension help. Some airbags, Timbrens, or other.

Jerry





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Pennsylvania

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Posted: 09/03/22 11:21am Link  |  Quote  |  Print  |  Notify Moderator

I’m with Jerry on this.. my buddy has a Solitude 375RES that we took my truck to pick up down in Nashville (16 hrs) ..

Towing that trailer with a 2500 is a stretch… I'm assuming your RAWR and tire capacity are both well over max…. Those are the 2 numbers that i look at..

If your over your tire capacity, that could give you the feeling of squishy/squirming..


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fj12ryder

Platte City, MO

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Posted: 09/03/22 11:27am Link  |  Quote  |  Print  |  Notify Moderator

What kind of tires, and what psi are you running them on the truck? What kind of hitch? Do you see any movement in the front of the trailer when you set it down on the truck, like it's flexing some? I'm assuming you've checked all the shackles, and any related suspension bolts, and hangers.

And I'll agree that is one big a$$ trailer for a 3/4 ton truck. Have you scaled the truck and trailer?


Howard and Peggy

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JIMNLIN

Oklahoma

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Posted: 09/03/22 11:59am Link  |  Quote  |  Print  |  Notify Moderator

Agree with weighing your trucks front and rear axle while hooked to the trailer and road ready.

Your 2500 has a 6000 rawr for carrying all the load in the bed.
Many newer gen 2500 Ram trucks rear axle can weigh in the 3000 lb range leaving around 3000 lb in the bed payload.

Overloaded rear axle (tires/wheels/rear spring pack) and worn out shocks on a truck with rear coil springs can make a bad handling combo.

A 2500 with a 6k rawr isn't a good replacement for a one ton srw truck with a 7230 rawr = a 1230 lb loss for carrying weight in the bed.

A 5th wheel trailer adds little to no weight on the trucks front axle.

Get all the trucks axle weights first and go from there.


"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers

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TXiceman

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Posted: 09/03/22 01:29pm Link  |  Quote  |  Print  |  Notify Moderator

UVW1
14200 lbs

Hitch Weight1
2900 lbs

GVWR
16800 lbs

Length2
41' 4"

I think you do not have enough horse to pull that trailer per the above numbers. A loaded camper of 16,800 lbs will have a loaded pin weight of roughly 3400#.

Forget the unloaded weights unless you never plan to add anything to the trailer including food, clothes, water or propane. But I have yet to see a camper that does not bring along clothes, food, propane, pets, wife and kids.

Ken


Amateur Radio Operator.
2013 HitchHiker 38RLRSB Champagne, toted with a 2012, F350, 6.7L PSD, Crewcab, dually. 3.73 axle, Full Time RVer.
Travel with a standard schnauzer and a Timneh African Gray parrot

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