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Old 10-07-2014, 09:24 PM   #1
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Rear suspension sag question

My current TT has 600 lbs tongue weight (I weighed it) this is 100 lbs more than the advertised dry tongue weight and I have 2.5" of rear suspension sag with my current setup. I am considering a new TT with a dry tongue weight of 775 lbs. I am going to upgrade my spring bars for my hitch from 800 to 1000 or maybe 1400 lbs if there is a benefit. Based upon my current setup I am estimating 875 lbs of tongue weight. My questions are: 1) How much sag is considered acceptable? 2) Will new spring bars help compensate for the increased tongue weight preventing too much sag?
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Old 10-07-2014, 09:33 PM   #2
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What size spring bars do you have now?

It also might be helpful to list what type of hitch you have as well. Is it something with chains or is it more like the equalizer 4pt, reese pro series with the sway control, or the reese dual cam setup?

My bars are rated for my current tongue weight and setup properly I get about .5 inch or rear sag. One more notch up with the bars or take one more washer out of my hitch head (I have the equalizer 4pt) it actually throws enough weight to lift the rear end instead of sag.

Check the manual for the hitch too, it should say in there what they would deem acceptable for rear sag. Some say no sag, some say a little is ok.

I'd think as long as you have bars rated for your current tongue weight or if you decide to upgrade, bars that would cover that tongue weight (I'd go 1000lb bars if you get the other trailer) you should be able to get it all adjusted to no sag or a half inch or less once setup properly. Sometimes it takes alot of playing around with it.
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Old 10-08-2014, 06:43 AM   #3
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I have a Eaz lift elite with chains and 800 lb bars.

So, it sounds like I should expect better performance from my hitch. Checking my TT with a level the trailer is level right now. If I get less sag I would be raising the front of the trailer...I assume I would have to drop the hieght of the hitch.

Could I upgrade my hitch and get better performance or is it simply adjustments?
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Old 10-08-2014, 07:01 AM   #4
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I would try getting your current hitch dialed in a little more. If you upgrade trailers the 800lb bars won't do it.

Try adjusting your hitch height. Then to get less sag tighten the links.

You want the trailer level or slightly nose down.

Good luck but I think you can dial it in a bit.
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Old 10-08-2014, 07:27 AM   #5
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need more info

It would be helpful to know what kind of unit and tv you have.
It's helpful to place that info in the sig line
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Old 10-08-2014, 07:44 AM   #6
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Added TV and TT to sig line...don't judge me; it's not a Forest River product...yet.
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Old 10-08-2014, 08:05 AM   #7
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I would adjust your hitch height first, then tweak the bars some. I had a slight sag in my '10 Silverado and we adjusted the hitch height and the sag was gone
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Old 10-08-2014, 08:47 AM   #8
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Are you describing "sag" as height below no load height or below level? I've seen trucks "sag", being nose high, which is a hitch adjustment. I also have had trucks "drop" about 2" from no load and are now level, which could be acceptable depending on your truck. Measure the height at the center of your fender openings(front and back) to see what the real attitude of your truck is, (nose up, nose down, level). I usually adjusted my hitch so that I used half the distance to level from no load height.
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Old 10-08-2014, 09:09 AM   #9
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The current WDH setup may need to be adjusted. If you are not getting the proper weight back onto the front axles, then the rear of the truck is going to sag, and the front raise a bit. Fender measurements and/or a trip to the scales (with 3 weigh-ins done) might been needed to make sure the WDH is setup correctly.

Another thing is that I think RAM still uses coil springs on the rear axle. Leaf springs can be "staged" so that as the load increases, the springs pack gets stiffer. Can't do that as well with coil springs.

1000 lb. spring bars should be a good fit with a listed dry tongue weight of 775 lbs.
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Old 10-08-2014, 09:32 AM   #10
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Here is how I measured. No load to the bottom of the draw bar 19 1/4" trailer hooked up it dropped to 16 3/4". Truck appears to be level. I will do as you suggest Aquaman and measure the fender height with and without trailer. I suspect I need a little more tension because the trailer feel heavier than it should.

This hitch was set up on a different truck and I didn't change anything because the camper was still level when hooked up to the new truck.

Mtnguy the truck is coil springs; I have added timberen helpers to it because I didn't like the way it felt stock. I may have needed the hitch adjusted from the beginning and didn't realize it.
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