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Old 06-18-2006, 07:34 PM   #1
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1976 26' Argosy 26
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To wheel bearing adjustment responders

To all who have responded to this post, I sincerely thankyou. I have been cursed with a RV that sways when passed by tractor trailer rigs and even slightly by large SUV's. I put new Goodyear Marthion D radials on her and put C rated truck tires on the pickup. I have replaced all the wheel bearings with your help; Howerver, My problem still exists. I would like to take this to the next level and ask what else do I need to do. The C rated truck tires are firestone destination LE's and I am running them 40 lbs in the front and 50 lbs in the rear of the 1/2 ton pickup as per the firestone personel. The tires seem to have a lot of flex and the rear of the pickup does move side to side quite a good ways when pushed and pulled. This is especially noted when hooked up to the RV. Go to higher rated tires or to the dealer? Would this be a running gear problem of which I have read some posts on this subject. Or maybe this is a load equalizing hitch. If this was happening to you what would be the things you would do to correct this issue and in what order. Again Thanks to all for your prompt and helpful reply.
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Old 06-18-2006, 09:28 PM   #2
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I had similar sway problems on my Jeep Grand Cherokee with Pmetric load range B OEM tires. A change to BFG LT, load range D tires solved my sway problems. I run them at 45 psi when towing. My hitch is a Reese dual cam, adjusted to Reese's specifications.
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Old 06-18-2006, 11:11 PM   #3
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Hello Micheal W,

I would suggest looking at your hitch setup (bars and the size of them ,and the tension when properly set)Also what kind of sway control do you have
if any? The reese setup uses the cam locks design to control the sway ,but
if the bar tension isn.t correct ,too light ? the E Z lift sway control and others say dual sway control on each side of the tongue may be required for long trailers and yours is 26ft. The 1/2 ton is light in the rear when the bed is empty ,no surprise there ,maybe some cargo in the bed to add some ballest weight to it .The heavier duty tire such as a D range would be a good choice
with a 3 ply sidewall ,and not rated ,but three ply total to give stability .
Radials do have sidewalls that can move around and feel squishy ,hence you adding more airpressure to stiffen them up.Now, first I would get the tires replaced ,as you have noted there movement is alot ,second make sure about your hitch setup and the height of the tv and trailer .Is it all sitting level when hitched? Is the tongue high? or low? needs to basically be level when bars are loaded .Third, hows the trailer loaded inside ? More tongue weight
too a point ,not excessive ,is always good helping sway.Make sure the load of your stuff in the trailer isn't all in the rear past the axle ,must be loaded properly .More tongue weight will put more weight also on the rear of the pickup as well .WD in itself except for the reese dualcam ,doesn't mean no sway,Tighten your sway control lever more tightly and see if that helps also
all else done first.


good Luck

Scott of scottanlily
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Old 06-19-2006, 08:33 AM   #4
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You need to differenciate between sway and being pushed by the truck bow wave.

"Pushed" is when you feel the unit moving to the right as the truck approaches and then to the left as you get sucked in as it passes. You can do little about the bow wave for little money except lean into it when you see them about to pass you.

"Sway" is when the unit continues to move back and forth even after they have passed. This means there is an instability in your rig.

Simplest and most effective thing is to add more air pressure to all the tires to stiffen up the sidewalls. If that works, you might consider going to beefier tires, which would cost you some money and make the ride harsher for you and the trailer. You might have to think about bigger bucks of newer axles with softer spring rate to take up some of the bumps and restore the ride. That is getting to be big bucks. You might consider a bigger tow vehicle with longer wheel base and heavier. They handle the "push" better than smaller trucks. (Also will cost you more money) .

Look into how the hitch is attached. Is it too far back from the rear bumper of the truck. That is a bad thing. Do you have a sway control element like a frictional damperner or twin cam system? Is it properly adjusted? If you do not have a sway contol element, it might make a good investment in you peace of mine and nerves.

Is your rig properly loaded? Not enough tonque weight. Too much gray water and sewage in the back of the trailer? Move the heavy stuff from the back of the trailer to the cap of the truck or the living room floor.
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Old 06-19-2006, 08:36 AM   #5
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Here's a couple more current threads on this topic that you may find informative as well:

http://www.airforums.com/forum...ing-23637.html

http://www.airforums.com/forum...hes-23694.html

Roger
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Old 06-20-2006, 12:35 AM   #6
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Hello michealW,
dwightdi touched on one item and is correct .That is the distance of the
hitch ball out the rear of the vehical ,too far out and ,sway will happen ,i have seen many hitch setups way out there ,too far for sure .this is somthing most don't even consider .On my travelall I myself had to move my hitch in towards the the vehical (the hitch /ball assy in the reciever) I had my machine shop drill a new hole in the 2" bar so the bar is inserted as far as possible in the reciever .The ball is now right at the bumper (trailer tongue clears) not touching bumper ,instead of the 4" back that it was and absolutly
stopped the sway I had when I refit the old 60s hitch setup to the standard 2" reciever .It took only 1 trip with the new hitch bar setup and when I got home I refit the bar /ball .Seems like a small amount ,but at the trailer it translates to quite alot.Those hitch heads /ball assy should never be way far out from the tow vehical ,get it as close as is possible .Note that with my old 1 3/4 reciever setup i had no sway ,but had the sway control and WD as I do now.

Scott
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Old 06-20-2006, 09:15 AM   #7
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Scott has given you some sound advice....I was thinking along the same lines as he's already indicated. Tires, though an important part of the process, before I changed more, I'd look at the hitch setup to make sure it was correct as Scott pointed out.
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Old 06-20-2006, 01:37 PM   #8
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Moving wieght around in your trailer as mentioned is a cheap and eazy way to play with the set up. Things that you could move or change that you carry when travelling:

Water in any of the tanks forward or aft - try empty and then full
Carry a loose cooler full of food? - move forward or aft
Outdoor equipment -
Or other items you may carry when traveling.

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Old 06-20-2006, 03:16 PM   #9
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Wow for a broad you're really mechanically talented...

an expression that was dismaying the second time I heard it, but...

Two words: Shock absorbers.

You talked about changing everything ELSE that could affect sway.... got old, weak shock absorbers?


Paula
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Old 06-20-2006, 03:46 PM   #10
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Paula, Good suggestion. And I for one would like to know if that would make a difference after the change. If you do this Michael let us know.

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Old 06-20-2006, 11:32 PM   #11
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You guys are the bests. I am sure that a newbie to RVing will get as much out of your responses as this newbie has. As I see it I've got a lot of work to do and money to spend, but these corrections will have to be made and that will happen before my next trip. Gee, I wonder how many lives you guys will save in the future. Maybe mine!! I will get back to Action and Paula on the shocks.. Thankyou
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Old 06-21-2006, 01:00 AM   #12
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Quote:
Originally Posted by Foiled Again
Two words: Shock absorbers.

You talked about changing everything ELSE that could affect sway.... got old, weak shock absorbers?
Paula
I actually bought new shocks but haven't had time to get them installed. The TV was ready for them anyway so towing just made it more of a priority. Ping me in a couple weeks if I haven't reported back.
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Old 06-21-2006, 02:43 AM   #13
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can you post a pic...

of your tow set up? What type of Tow Vehicle, and set up with your trailer? I have a 26ft Argosy. It did sway a bit when I changed from the chevy Astro to my 1 ton Dodge van... I had the hitch head set too high (trailer looked like the tail was low, hitch high). I'd post a pic here before spending too much money.

A pic is worth a thousand words. All of the above posts could be right, but it's good to start with the basics.
Marc
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Old 06-21-2006, 02:54 AM   #14
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Chevy pu 1500..

ahh, what a little reading will tell me! I'm assuming a two wheel drive? Even my little Astro did move side/side quite a bit when I pushed on the sides of the van (the 1 ton Dodge doesn't budge), however, the Astro really didn't sway too much either. Do you have sway control? How are your chains set up on the w/d hitch? I've noticed that there can be a real difference too if I didn't have enough tension in the chains (not enough weight transfered to the front wheels of my van).

Homework that may help -
- Post a pic of your truck and trailer together from the side.

- Measure up from the top of your trucks' tires to the bottom of the fender edge front and rear, before and after hooking up the trailer (to see how much drop there is being put front and rear by the weight distribution set up)

- If you can, find a local CAT scale (search "CAT" on the forums for how to use them). Measure your trucks front/rear and trailer wheel weights all hitched up. That can also help us.

Let us know!
Marc
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