2500 Ram Box air ride rocking back and forth with a 5th wheel camper

[MrThury]

I'm revisiting this thread to post my latest findings. I weighed both my toy hauler and my Jayco. The toy hauler loaded heavier than I have ever had it was 900 lbs over my pin weight. I expected that because I was hauling coolers and camping gear for 10 people. My Jayco was around 200 lbs over my tongue weight. Not as bad as I expected. I still couldn't say there was anything wrong with my truck because I was over max weight. Fast forward a month or two and I pick up a pallet of shingles weighing #1400 and put them in the truck. Any speed over 55 mph and it rocked so bad I about ran off the road. I now know for a fact it's the truck because I am under the 2034 lb limit. Took it to the local Ram dealer, they think it might be the shocks even though this problem started with less than 15,000 miles on the truck. They won't do anything because it's now out of warranty. I am taking it back to the dealership I bought it from because I originally brought it in when it was in warranty and they said they can run it under warranty because of that. Hopefully they can figure out something. Driving 50 to 60 down the interstate feels almost as scary as driving to fast when it's working properly. Had a lot of vehicles come close to running into me this last weekend.

 

[68PowerWagon]

Hopefully they can get it figured out for you. Please keep us updated.

 

[Bike_Pilot]

I'd suggest shocks and a Thuren rear track bar. Or trade it for a 3500. The inboard coil springs arrangement on the 2500 is not ideal for hauling much weight. Fwiw I put about 4,000 lbs of water in the bed of my SRW 3500 which is on 37" tires and drove it through the mountains in Colorado. The weight made almost no difference in how the truck handled.

 

[18CrewDually]

I'll start by recommending a 3500.
The issue with the 2500s in your case and most folks that feel the instability, is the truck's rear suspension by design. It uses coil springs/airbags that are mounted inboard (closer to center) in comparison to a leaf sprung truck like a 3500. This gives the "load" more leverage causing the sway or uneasy feeling.
One thing I've recommended in other threads, and it helps alot, is a large rear anti-swaybar like the one offered by Hellwig.

On edit I'm adding a picture below. The yellow line on the right is the center line of the airbag/coilspring of a 2500. The line on the left is where the leaf spring would be on a 3500. That's the difference in stability. A thick heavy swaybar ties the left and right together, making it more resistant to the roll.

 

[nlambert182]

When I ordered the truck I asked the salesman about the 3500. He thought I would be okay with the 2500. The tow ratings we found listed were 19,810 and 3180 for cargo weight. The cargo weight listed on the door of the one I have is 2034 lbs. The one camper I'm pulling is a Jayco Pinnacle that is completely empty including furniture. The other is a toyhauler with 2 big bikes in it. I'm sure I am overloading the pin weight with the toy hauler. The thing that aggravates me most is I could pull both of them just fine with my 2014 ¾ ton Ford diesel. Even my 97 ¾ ton GMC pulls them ok but does really squat. It just doesn't have the power when there are hills. I traded the Ford because I wanted modern comforts. The other thing that makes me question that there may be something wrong with the truck is that it started rocking extremely bad when I went over an overpass in a curve on the interstate with around 500 lbs of fencing in the bed.
Bottom line, I will be taking it to the scale and getting some exact numbers to see where everything stands.

Truck salesmen will always tell you that. So will RV salesmen. 9 times out of 10, they're wrong. They just want to make the sale.

You're way overloaded my friend. I towed a 14k fifth wheel with my 3500 and it leveled it. You need a 3500 (and realistically, a dually). You're in the range of a 2,800-3,000 lb pin weight (use the fully loaded advertised weight of the camper x 20% for a ballpark reference) on that rig. Could be more.

Depending on how much you've towed overloaded you could have other damaged components at this point causing the issues. It would be hard to tell.

 

[oe542bob]

18CrewDually,
The OP’s truck has rear air bag suspension, no coil springs.

 

[Zoe Saldana]

When I ordered the truck I asked the salesman about the 3500. He thought I would be okay with the 2500. The tow ratings we found listed were 19,810 and 3180 for cargo weight. The cargo weight listed on the door of the one I have is 2034 lbs. The one camper I'm pulling is a Jayco Pinnacle that is completely empty including furniture. The other is a toyhauler with 2 big bikes in it. I'm sure I am overloading the pin weight with the toy hauler. The thing that aggravates me most is I could pull both of them just fine with my 2014 ¾ ton Ford diesel. Even my 97 ¾ ton GMC pulls them ok but does really squat. It just doesn't have the power when there are hills. I traded the Ford because I wanted modern comforts. The other thing that makes me question that there may be something wrong with the truck is that it started rocking extremely bad when I went over an overpass in a curve on the interstate with around 500 lbs of fencing in the bed.
Bottom line, I will be taking it to the scale and getting some exact numbers to see where everything stands.

>When I ordered the truck I asked the salesman about the 3500.

Were his lips moving?

Seriously, you listened to the salesman?

Did you also pay the sticker price or more?

My friend, I'm not trying to be mean but really, 'the salesman'!!!!!!!!!!!!!!!

 

[18CrewDually]

18CrewDually,
The OP’s truck has rear air bag suspension, no coil springs.

Yes, same design and negative effects whether it's airbag or coil spring. They're both inboard. Here's a picture to help with understanding. I added a picture to my original post also.

 

[rule18]

>When I ordered the truck I asked the salesman about the 3500.

Were his lips moving?

Seriously, you listened to the salesman?

Did you also pay the sticker price or more?

My friend, I'm not trying to be mean but really, 'the salesman'!!!!!!!!!!!!!!!

Ordinarily I'd agree, but the OP made it clear that his truck salesman is his nephew (post #11). I'd be pretty surprised if the guy's family F'd him, but I guess you never know...

 

[Zoe Saldana]

Ordinarily I'd agree, but the OP made it clear that his truck salesman is his nephew (post #11). I'd be pretty surprised if the guy's family F'd him, but I guess you never know...

Was there $ involved? If so, it is very passible his family F'd him.