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Old 06-09-2021, 08:42 PM   #1
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Riverstone 39FK

I have a Riverstone 2020 39Fk. I have a problem with the trailer fish tailing. I check all obvious things. At slow speed its very slow then as the speed increases it starts to fish tail faster.
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Old 06-09-2021, 09:05 PM   #2
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First questions are what is your pin weight, trailer weight, tire pressures (truck and trailer), are the tanks loaded and where are the tanks located and what is your tow vehicle?

Here are the specs I found on the trailer:
Hitch Weight:2665 lb.
GVWR:18665 lb.
UVW16099 lb.
CCC2566 lb.
Exterior Length:43' 3"
Exterior Height:13' 4"
Exterior Width:102"
Fresh Water:83.00 gal.
Gray Water:123.00 gal.
Black Water:41.00 gal.
Awning Size:20'

With that much trailer, your loaded pin weight will be around 3800#. I sure hope you have a 1 ton DRW truck.
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Old 06-10-2021, 04:34 AM   #3
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Black tank with 41 gallon capacity? With the fresh and gray at over 200 gallons that's almost criminal.
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Old 06-10-2021, 09:06 AM   #4
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Agree with any SRW (single rear wheel) truck will not be nearly enough truck. The squishy tires will not give a solid, comfortable driving experience.

A modern dually truck is what you need.
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Old 06-10-2021, 06:48 PM   #5
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Quote:
Originally Posted by jsb47 View Post
I have a Riverstone 2020 39Fk. I have a problem with the trailer fish tailing. I check all obvious things. At slow speed its very slow then as the speed increases it starts to fish tail faster.
is it your trailer or both the truck and trailer? What tires are on the trailer (brand , size and how much air pressure)?

And as other post have asked what do you have for a truck ? Duel wheel?

Trailers will follow the crown in the road and once in a while on a road that has some grooves in it will dance a little that you may see in the rear view.
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Old 06-10-2021, 10:41 PM   #6
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Originally Posted by xc-mark View Post
is it your trailer or both the truck and trailer? What tires are on the trailer (brand , size and how much air pressure)?

And as other post have asked what do you have for a truck ? Duel wheel?

Trailers will follow the crown in the road and once in a while on a road that has some grooves in it will dance a little that you may see in the rear view.
I have a 2012 Chevy 3500 dually long bed HD. Tires are nw with 80psi.
The fifth wheel has Good year tires with 125psi
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Old Yesterday, 12:20 AM   #7
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Quote:
Originally Posted by TXiceman View Post
First questions are what is your pin weight, trailer weight, tire pressures (truck and trailer), are the tanks loaded and where are the tanks located and what is your tow vehicle?

Here are the specs I found on the trailer:
Hitch Weight:2665 lb.
GVWR:18665 lb.
UVW16099 lb.
CCC2566 lb.
Exterior Length:43' 3"
Exterior Height:13' 4"
Exterior Width:102"
Fresh Water:83.00 gal.
Gray Water:123.00 gal.
Black Water:41.00 gal.
Awning Size:20'

With that much trailer, your loaded pin weight will be around 3800#. I sure hope you have a 1 ton DRW truck.
Quote:
Originally Posted by jsb47 View Post
I have a 2012 Chevy 3500 dually long bed HD. Tires are nw with 80psi.
The fifth wheel has Good year tires with 125psi

Well I would have the alignment of the trailer axles checked to make sure they are set correctly.


It is nice to have a 3500 DRW, but you are pushing the tow rating of the TV, at 18,000# for the 2012 unit.


I would also look at the Yellow Payload sticker for inflation for the front and rear tires, likely 70 psi to 80 psi fro fronts and 65 psi for rears, if so try dropping the rears to 65 to 70 psi.


That said with ONLY a 2,566# payload for the 5er, it may be heaver than 18,665#. The real pin weight is likely between 3,733# (20% of GVWR) and 4,666# (25% of GVWR).



I would suggest a trip to the scales to see how your weights are, especially, pin weight and 5er total weight Pin + axle weights.
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Old Yesterday, 12:23 AM   #8
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I might add the question how close to lever does it tow?
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Old Yesterday, 11:36 AM   #9
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work through it

Fifth wheels only sway due to a few factors.

1. Not enough pin weight. You should have 20 to 22 % pin weight. If you have a light pin weight it can cause sway. ( weight the truck and trailer and get your pin weight.)

2. Rear axle on your truck overloaded. Weight your truck empty and loaded. Look at your rear GAWR and ensure you are below it. Check your fifth wheel hitch location. Is it over the axle?( yes you can overload a dually)

3. Check for worn suspension parts on the truck and trailer. Also check alignment.

4. Ensure you are towing level. Towing nose high or low can cause overloading an axle and cause sway.

5. Over inflated tires on the rear of your dually can cause bouncing and possible sway. (I had mine at 80 PSI and it pulled terrible. Went to 65 PSI and it towed great)

6. If you cannot find any issues have a friend pull it with their truck and see if you get the same results to eliminate the truck or the trailer.
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