trailer sway with fifth wheel.. but also does not feel right not pulling a trailer

[Fowlthing]

2020 Model Millestone camper 34 foot long.. 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 caused by 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. Measures good from axle to the pin. Can't see spring damage on trailer or on the truck.

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.

 

[H3LZSN1P3R]

A set of airbags will eliminate it. The issue is the OEM springs are too close to the center of the axle airbags mount out further and stabilize the load.

Does your hitch head pivot in all 4 directions?

 

[Fowlthing]

Yes. We have an Anderson hitch. So it does pivot in all directions.

 

[H3LZSN1P3R]

Yes. We have an Anderson hitch. So it does pivot in all directions.

I would ditch that nightmare in a heartbeat but thats just for safety. For the “sway” bags or sumo springs/ other style bump stop springs will eliminate your issue