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08-17-2013, 10:05 AM
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#1
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Senior Member
Join Date: Jul 2011
Location: Iowa
Posts: 406
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CAT scale results
Ok, so we finally found some time to take the truck and new trailer to the CAT scale.
TV specs:
FGAWR 3950
RGAWR 3950
GVWR 7000
GCVWR 15000
Trailer:
Axles 5000lbs combined
GVWR 5450
1st weigh
Steer Axle 3500
Drive Axle 2680
2nd weigh, springs bars engaged
Steer Axle 3400
Drive Axle 3300
Trailer Axles 4400
3rd weigh
Steer Axle 3220
Drive Axle 3600
Trailer Axles 4280
I come up with a GTW of 4920lbs and an actual TW of 640lbs, which is right at 13%. That is of course if I am figuring this right.
My concern is the 100lb difference between the hitched and unhitched weight on the steer axle. I don't know if that is close enough or not, I do know reducing the links under tension by one is way to much, the back of the truck doesn't drop at all. The tilt adjustment also seems very "coarse", I almost think tilting it will no longer allow enough links under tension.
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2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
ITBC
Reese "Pro Series" 800lb Trunnion WDH w/sway control
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08-18-2013, 04:17 PM
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#2
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Moderator Emeritus
Join Date: Apr 2011
Location: Michigan
Posts: 9,424
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Your correct on your 4,920lb gross TT weight, and a 640lb loaded tongue weight. Most CAT scales have a possible 40lb plus/minus weight error..., but a 100lb steering axle delta shouldn't be a major concern, but I would try and dial it in a little closer unless you plan to add some added /passenger/cargo weight to the TV.
If reducing the links under tension by one link is to much, then I would leave well enough alone. Tilting the ball mount toward the TT one position will accomplish almost the same end result as reducing one link under tension (in most cases).
Bob
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2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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08-18-2013, 04:54 PM
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#3
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Senior Member
Join Date: Jul 2011
Location: Iowa
Posts: 406
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Well, I have to add a little more info to this. We noticed that the trailer seemed a little "bouncy" yesterday, even with 13% TW. So I took it to a fairly flat parking lot and noticed the tongue was just slightly pointing up. So we lowered the hitch head one notch and that made a world of difference, it now points just slightly down and no "bouncy" feeling when towing.
After doing that we took it back to the CAT scale for some more weights.
With 6 links under tension we had 3300lbs on the steer axle, even less than before. We then went to 5 links and were at 3400lbs. To see what would happen we did the minimum of 4 links under tension(according to the hitch instructions) and got a steer axle weight of 3520lbs. My question is, will having only 4 links cause any issues when turning? Should I try tilting the head back or maybe just go with 5 links? It seems to handle just fine with the 100lbs less on the front.
__________________
2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
ITBC
Reese "Pro Series" 800lb Trunnion WDH w/sway control
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08-18-2013, 06:58 PM
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#4
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Moderator Emeritus
Join Date: Oct 2012
Location: Cape Coral, Florida
Posts: 4,796
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I think i would be happy with 100 lbs less on front.
I personally don't like to be over my unhitched weight on the steering axel. especially knowing scales can be +/- 40 lbs.
Sounds like you have a good set up at 5 links one you ot the nose down.
JMHO,
Doug
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Cape Coral, Florida
2021 Toyota Tundra SR5, 5.7 V8
2022 Jayco 240RBS
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08-18-2013, 08:05 PM
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#5
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Senior Member
Join Date: Jul 2011
Location: Iowa
Posts: 406
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Quote:
Originally Posted by Rustic Eagle
but a 100lb steering axle delta shouldn't be a major concern, but I would try and dial it in a little closer unless you plan to add some added /passenger/cargo weight to the TV.
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So if more weight is added, would it possibly return more to the Steer axle? Just trying to understand.
Quote:
I think i would be happy with 100 lbs less on front.
I personally don't like to be over my unhitched weight on the steering axel. especially knowing scales can be +/- 40 lbs.
Sounds like you have a good set up at 5 links one you ot the nose down.
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This is kind of what I am leaning towards, it took quite a bit of raising the tongue and truck to get them on with only 4 links and it still took some force to swing up the brackets. I also don't care for how close the bars are to the frame, though we seemed to have no issues backing into our driveway.
__________________
2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
ITBC
Reese "Pro Series" 800lb Trunnion WDH w/sway control
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08-19-2013, 03:50 PM
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#6
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Senior Member
Join Date: Feb 2011
Location: SW Ontario
Posts: 1,393
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For stability running down the highway, you are better off with the 5 link and 3400 lbs on the steer axle. Too much weight on the steer axle makes for an unstable situation in windy conditions.
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2013 Jayco Eagle 31.5RLDS
2018 Silverado 2500 HD Duramax
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08-20-2013, 03:00 PM
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#7
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Moderator Emeritus
Join Date: Apr 2011
Location: Michigan
Posts: 9,424
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Quote:
Originally Posted by amabee
So if more weight is added, would it possibly return more to the Steer axle? Just trying to understand....snip
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Depends on the location of the added weight...., "forward" of the TV's rear axle will add a percentage of the added weight.
I know that on most GM Trucks and SUV's if you exceed the TV's unhitched steering axle weight the suspension stops will be compressed creating a rough ride.
I wouldn't use 4-links under tension if it produces an "over-weight" on the steering axle...., stay with 5-links (3.400lbs).
The reason your WDH installation instructions state "minimum 4 links" is because the Pro-Series (Reese, Draw-Tite, etc.) has a straight (flat) spring bar tail and is not considered a heavy duty WDH. Most heavy duty WDH's (round & trunnion) have a radius at the spring bar tail that lowers the location of the connecting chain link, and I believe the dimensional relationship of spring bar to ball mount may differ a little as well...... these installation instructions (Reese, Draw-Tite, etc.) state 5-links minimum. Follow the installation instructions that came with your WDH, going below the recommended chain links under tension will cause the spring bar tail to come into contact with your TT's A-frame during TV turns.
Hope this helps.
Bob
__________________
2016 GM 2500HD 6.0L/4.10
2018 Jay Flight 24RBS
2002 GM 2500HD 6.0L/4:10 (retired)
2005 Jayco Eagle 278FBS (retired)
1999 Jayco Eagle 246FB (retired)
Reese HP Dual Cam (Strait-Line)
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08-20-2013, 06:36 PM
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#8
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Senior Member
Join Date: Jul 2011
Location: Iowa
Posts: 406
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Thank you all very much for the advice/info. I will go with 5 links and call it good.
__________________
2013 Starcraft Travel Star 229TB
2011 Jayco X17Z(traded in)
2010 Jayco Jay Series 1207(traded for the 17Z)
2011 Chevrolet Silverado 2500HD Z71 CC 6.0L/3.73
ITBC
Reese "Pro Series" 800lb Trunnion WDH w/sway control
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