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Zeppe807's avatar
Zeppe807
Explorer
Jan 16, 2015

My relentless pursuit to cure trailer sway - the dancing TT

Hello All,
I'm a newbe to the forum, but a lurker for awhile. I have been towing all sorts of trailers for the last 17 years in just about any condition. I also know this May turn into a HA vs PP vs "set your rig right" discussion; and I welcome that civil discussion.

General rig info:
I have a 2006 dodge ram 3/4 ton, Diesel, 4x4, short bed, air bags, quad cab, with 35" tires. And I have a 1999 29' Kit Sun Chaser TT with a pull out and bunk beds. It's 7,900 to 9,900 lbs and has a 4' rack off the back.

I purchased this trailer a year ago to replace our old 21' one since we have three little children now. Since day one (a windy day) it has been a bear for me to handle. I chalked it up to the wind the first day, but it has never gotten better.

So far I have rebuilt the Entire front steering of my truck: BJ, tie rods, track bar, wheel bearing, steering box and support. And with Top of the line products. I have put two new sets of different tires. Tried different air pressures and different air bag settings. I have lifted and lowered the hitch. Tried different WD bar settings.

In the trailer I have moved as much of my stuff to the front. Loaded stuff in the cabinets as normal. My water tank is directly above my axles, and have had it filled and emptied. My holding tanks are in the rear and I've had those loaded and unloaded. The rack has been loaded and unloaded. I've adjusted multiple settings (one at a time) on the same trip. And new 16 HD tires and wheels, along with new shackles.

So frustrated.

The trailer sways at any given chance: bumps, turns, wind, slowing down. But not under hard throttle, which is how I drive out of sketchy situations...

My trips are almost always over a hundred miles from home and we go about 8 to 12 times a year. And now I stress about any trip more than I ever have.

The only things I can think of that I haven't done is checked my trailer axles for squareness and the HA/PP hitch. As I fishtailed around a big rig on our way here she yelled at me that when I get home I'm buying a Propride or Hensley Arrow (although I don't know where she thinks the money is coming for one...)

I NEED HELP! I am sitting by my campfire on Donor Pass in California in the snow, stressing about my trip home.

Joe Zeppe

188 Replies

  • Not only do you need to scale it to know where your trailer and rig stand for proper WD setup, especially with that much tire, you should have the trailer checked for proper tracking just to make sure the axles are running true. Also, BIG points you don't mention is what diameter and width wheel are you running those 35" tires on, and what ply of tire are they? Running tall, fat tires on a narrow wheel with lots of sidewall makes for really squishy handling and really bad trailing!
  • with a 3/4 ton truck, you can go a little "heavy" on the tongue...closer to 15%. yes, you need to hit the scales, loaded like you are going camping to see what you have.

    good luck!
  • sgrizzle wrote:
    * either too soft TT tires? need more psi?
    * need more wt on the hitch?


    80 psi uniroyal Laredo HD. Great tires by the way.
  • Old-Biscuit wrote:
    Have you taken the truck/trailer across a set of CAT scales and been weighed?

    Weigh truck w/o trailer

    Then weigh truck and trailer combo.


    Now you will have starting point for setting up combo.

    Most bumper pull trailer sway is due to light tongue weight/set up
    Also...is trailer level when hitched?


    I have tried nose up, level, nose down, and different levels with the air bags inflated and deflated. Nose down to level seems the best.

    I was going to weigh it at my local free scales, but they closed. I have always gone toward the 10% + tongue weight rule (?). And I think I'm close, but I want to get it weighed.

    Good points, thanks. I need to go to the feed mill and get it checked out.

    Joe
  • Old-Biscuit wrote:
    Have you taken the truck/trailer across a set of CAT scales and been weighed?

    Weigh truck w/o trailer

    Then weigh truck and trailer combo.


    Now you will have starting point for setting up combo.

    Most bumper pull trailer sway is due to light tongue weight/set up
    Also...is trailer level when hitched?


    Agreed you need weights to determine how balanced your RV is
    What is your tongue weight?
  • * either too soft TT tires? need more psi?
    * need more wt on the hitch?
  • Have you taken the truck/trailer across a set of CAT scales and been weighed?

    Weigh truck w/o trailer

    Then weigh truck and trailer combo.


    Now you will have starting point for setting up combo.

    Most bumper pull trailer sway is due to light tongue weight/set up
    Also...is trailer level when hitched?