shorthair
vancouver, wa. usa.
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Rollincool wrote:Like Barney said.
And, a lot of manufacturers weigh in the "dry" weight before they start adding options. So if you're dry weight says 3900lbs, (example), you can bet it's more like 4500 or so pounds.
I would take it to a scale and get it weighed so you would know for sure. 
At the very least, I once made an offer contingent on the actual weight being within 10% of advertised & they refused.
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Drago
Alta Loma,Ca.
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Sorry for the confusion, I am looking at a forest river 29fbsp and have taken it to the scales for a test drive. I asked to do so before I buy and wanted to see how it towed with my Sub. Thanks again for your replies.
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Ron Gratz
full time RVer
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Joined: 12/27/2003
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Ron Gratz wrote:With the TT attached, the load on the drive axle increased by 5300-3460 = 1840#. If you were NOT using a weight distribution system when you were on the scales, the tongue weight would have been about 1840/1.5 = 1227#.
Drago has asked for an explanation of how I obtained the estimate of 1227# for the unknown tongue weight. I will post my response here in case any others are interested.
Normally tongue weight could be calculated from the sum of the steer axle load plus the drive axle load with the TT attached, and without WD applied, minus the sum of the steer axle load plus the drive axle load without the TT attached. Drago did not measure the steer axle load with the TT attached, so a different approach was required.
The wheelbase of the Suburban is 130" and I assumed the distance from the drive axle to the ball was 65".
When WD is not applied, the relationship between the tongue weight and the increase in drive axle load can be obtained by using the steer axle as a fulcrum and equating the moments about the steer axle.
For the above example, the distance from the steer axle to the ball is 130"+65" = 195". The moment due to tongue weight is 195*TW.
The distance from the steer axle to the drive axle is 130". The moment due to the increase in rear axle load (RAL) is 130*RAL.
In order to have static equilibrium, the two moments must be equal. Therefore, for the above example, the relationship between TW and RAL is given by:
195*TW = 130*RAL or RAL = TW*(195/130) = 1.5*TW And, TW = RAL/1.5
Since the increase in rear axle load was measured to be 1840#, the tongue weight can be approximated as: TW = 1840/1.5 = 1227#
The TT weight is then equal to the sum of the TW plus the TT axle load.
Ron
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shorthair
vancouver, wa. usa.
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Ron's #'s are ok but even simpler is weigh the truck then weigh the combined rig subtract the first from the later for the TT weight, if weighing on an CAT scale you can at the same time get axle weights which will tell you how tight to set your bars at. not sure where your at but in the NW the states leave the scales on while closed so if you have one close by & some time to kill you can find all kinds of combos to try.
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Ron Gratz
full time RVer
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shorthair wrote:Ron's #'s are ok but even simpler is weigh the truck then weigh the combined rig subtract the first from the later for the TT weight,---
Usually, this can be done.
However, Drago did not measure the combined weight of the rig. He only reported the drive axle load and the TT axles load when the TT was attached.
Since he did not report the steer axle load with the TT attached, the combined weight could not be calculated and some "guesstimating" was required.
Ron
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Drago
Alta Loma,Ca.
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This is all great info, thanks to all who helped and please stay safe.
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SemperFiCop
USA
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Drago wrote:This is all great info, thanks to all who helped and please stay safe.
So,
What did You end up doing?
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Drago
Alta Loma,Ca.
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I have decided to look for a lighter trailer, the one I was looking at will in the long be run be to heavy and stressful. Thanks to everybody for their help.
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jaycocamprs
Ringgold Georgia
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fordsooperdootydieselsmoker wrote:Jayco prints out a final "as it is wheeled out the factory door" as shipped weight sticker that is actually fairly accurite. The scale is literally right outside the barn doors of the manufacturing facility. Gives you a pretty good idea of what you got! Dry weight including hitch and all installed options!
When we bought our JayFlight I took it by the scale on the way home. It was within the 20lbs (.01 ton) increments that the truck scale reads. This was after the walk through. And included full propane bottles, and battery.
2004 Silverado 2500HD
2007 JayFlight 28.5 RLS
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shorthair
vancouver, wa. usa.
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Ron it is easier to help if we get all the necessary info ain't it ?
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