RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
 

Go Back   Keystone RV Forums > Keystone Fleet | Keystone RV Models > Travel Trailers
Click Here to Login

Reply
 
Thread Tools Display Modes
 
Old 05-13-2020, 07:12 AM   #41
flybouy
Site Team
 
Join Date: Oct 2011
Location: Joppa, MD
Posts: 5,423
Quote:
Originally Posted by jadatis View Post
Front looses 220 lbs and Drive gains 1200lbs would suspect a tongweight of 980 lbs.
Is 100 lbs less then I calculated. Can be becauae of inacuract of scale, 100 lbs on these weights is not much. Even a calibrated scale is allowed one measure step different , in Europe mostly 20 kg= 44lbs.
Can give 30kg=66lbs difference in measurement, because weights in between are rounded.
Maybe they do math differently there but 100 lbs variance from a 1,000 lb. load is 10% So if the scale is 10% off in one direction means a 20% spread (+/- 10%). That's unacceptable for a "calibrated scale" in my book.
__________________

__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
flybouy is offline   Reply With Quote
Old 05-13-2020, 07:31 AM   #42
flybouy
Site Team
 
Join Date: Oct 2011
Location: Joppa, MD
Posts: 5,423
Quote:
Originally Posted by JRTJH View Post
The better weigh system is a "black box with an app for smart phones" that uses the vehicle attitude/weight sensors to calculate an "apparent weight on the hitch". For me (other's may/probably do feel differently) Anyway, for me, the "jury is out" on how much I'd trust a scale that connects to my smart phone via Bluetooth to give me a "calculated weight" based on spring squat as measured by the gyro sensor in the CPU..... I know NASA gave us lots of "high tech stuff" but a scale based on vehicle attitude ???? Hmmmmm
I use a Shear Line scale but IF I bought that system I would take a reading while setting on a Cat scale. An accurate reading compared to the Cat (using the certified weight) then o.k. If it's appreciably off then I'd return it.

My personal preference would be to validate the product, the truck's computer, and the software that translates that to my phone. YMMV
__________________

__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
flybouy is offline   Reply With Quote
Old 05-13-2020, 10:59 AM   #43
jadatis
Member
 
Join Date: May 2013
Location: Holland ( Europe)
Posts: 70
Quote:
Originally Posted by flybouy View Post
Maybe they do math differently there but 100 lbs variance from a 1,000 lb. load is 10% So if the scale is 10% off in one direction means a 20% spread (+/- 10%). That's unacceptable for a "calibrated scale" in my book.
But on the lowest weight of 4600lbs ( drive axle without trailer ) 66 lbs is only 1.42% .

I would even bett that if a person of 150 lbs would stand on the same scale, it would give something between 100 and 200 lbs.
jadatis is offline   Reply With Quote
Old 05-13-2020, 12:04 PM   #44
flybouy
Site Team
 
Join Date: Oct 2011
Location: Joppa, MD
Posts: 5,423
Quote:
Originally Posted by jadatis View Post
But on the lowest weight of 4600lbs ( drive axle without trailer ) 66 lbs is only 1.42% .

I would even bett that if a person of 150 lbs would stand on the same scale, it would give something between 100 and 200 lbs.
Every scale has a range as well as +/- % accuracy. Your example of a person of 150 with a 100 to 200 range is now +/- 33%.
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
flybouy is offline   Reply With Quote
Old 05-13-2020, 12:20 PM   #45
jadatis
Member
 
Join Date: May 2013
Location: Holland ( Europe)
Posts: 70
But a scale for trucks is not made to weigh a relatively low weight of only one person.
But mayby someone wants to try it out as experiment.
jadatis is offline   Reply With Quote
Old 05-13-2020, 12:43 PM   #46
flybouy
Site Team
 
Join Date: Oct 2011
Location: Joppa, MD
Posts: 5,423
Quote:
Originally Posted by jadatis View Post
But a scale for trucks is not made to weigh a relatively low weight of only one person.
But mayby someone wants to try it out as experiment.
Not alone but with the weight of a truck on it yes it should. When I bought my Sherline tongue scale it came with 2 gauges. I used the zero to 1K scale gauge first with a board and weighed myself. It was dead accurate. Changed to the next gauge ( 2k eack tick is 50lb.) and it was accurate.

So my point being, you can guess or you can know. I like to know so I bought the proper tool. I've never been one to use a screwdriver as a pry bar or use an 8 lb. maul to drive in a finish nail. YMMV
__________________
Marshall
2012 Laredo 303 TG
2010 F250 LT Super Cab, long bed, 4X4, 6.4 Turbo Diesel
flybouy is offline   Reply With Quote
Old 05-13-2020, 07:33 PM   #47
Ken / Claudia
Senior Member
 
Join Date: Nov 2012
Location: Fruitland
Posts: 2,882
The DOT scales are certified to be actuate for court/cites to 200 lbs plus/minus and show last numbers in 20 lb rounding. I man will not show anything standing on them, well at least me at 180lbs when geared up.
Some say CAT scales are 100% but I do not know if that's really true. I have only been around for the DOT scales when tested.
__________________
2013 24RKSWE (27ft TT) Cougar 1/2 ton series
2013 Ford F350 4x4 CC 6.7 engine, 8 ft bed 3.55 rear end lariat package
Retired from Oregon State Police in 2011 than worked another 9.5 years as a small town traffic cop:
As of 05-2020, I am all done with 39 years total police work. No more uniforms for me.
Ken / Claudia is offline   Reply With Quote
Old 05-14-2020, 02:59 AM   #48
notanlines
Senior Member
 
notanlines's Avatar
 
Join Date: Oct 2014
Location: Germantown, TN
Posts: 4,393
All you want to know about scale accuracy (CAT) and then some:
https://fifthwheelst.com/commercial-...ghing-rvs.html
__________________
Jim in Memphis
Wife of 49 years is Brenda
2019 F450 6.7 Powerstroke
2017 Mobile Suites 40RSSA
2015 26TBUD Salem Forest River (For Alaska Trip)
2001 Road king w/matching Harley sidecar
notanlines is online now   Reply With Quote
Old 05-17-2020, 04:45 PM   #49
hazmat456
Junior Member
 
Join Date: May 2020
Location: Tomah
Posts: 11
Quote:
Originally Posted by Steve's 70-5 View Post
Here are the weight

Steer axle. 4720
Drive axle 4660
Trailer 5920

Truck only
Steer axle 4940
Drive axle 3460

I just need tongue weight. I think I do not have a heavy enough bar for my sway control. Manufacture wants tongue weight to tell me what I need.

A Sherline scale is probably in the future
You have only lost 200lbs on the front. without wd hooked up you could be up to 400 lbs light in the front. Without that third scale weight nobody knows what your tounge weight is to be able to say if you need different bars or just a simple adjustment. My rough guess is that you do not have that heavy of a trailer and your 650 bars are the correct ones. Your trailer only weighs 6900, you should only have around 800 lb tounge.
__________________

hazmat456 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump

Powered by vBadvanced CMPS v3.2.3
Disclaimer:

This website is not affiliated with or endorsed by the Keystone RV Company or any of its affiliates in any way. Keystone RV is a registered trademark of the Keystone RV Company.


All times are GMT -8. The time now is 03:58 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
×