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06-06-2018, 08:19 AM
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#1
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Member
Join Date: May 2017
Location: Hillsboro
Posts: 87
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Tongue weight effect of full fresh water tank(s) on Jay Flight SLX 212qbw
I recently purchased a 212qbw Rocky Mountain Edition. The 212qbw has rear mounted fresh water tank or in the case of baja or Rocky Mountain editions they have dual rear mounted tanks due to trailer floor plan and design.
In preparation of boon docking I was wondering the effect (actual measurements if you know them) you had on your trailer tongue weight with full fresh water tanks. I realize many people fill up the fresh water tank when they get to their destination and travel empty so we don't need to debate traveling full or empty.
Thanks in advance.
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2018 Jay Flight SLX 212QBW Rocky Mountain Edition
2016 Ford F-150 XLT 4x4 SuperCrew 3.5L Ecoboost
HD Towing Package 145" WB
Andersen WDH
560 watts solar, roof mounted and portable suitcases
2000 watt PSW Inverter
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06-06-2018, 08:51 AM
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#2
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Moderator Emeritus
Join Date: Apr 2011
Location: Michigan
Posts: 9,424
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OregonPerson,
Good question and overlooked by many.
Look forward to see member responses that have actually weighed both with/without full fresh water tank(s) with the SLX 212QBW.
If you decide to take your TV/TT combination for a weigh-in comparison the following JOF thread may be helpful:
CAT Scale how-to: https://www.jaycoowners.com/forums/f...v-tt-3871.html
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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06-06-2018, 10:06 AM
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#3
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Senior Member
Join Date: Mar 2017
Location: Lubbock, TX
Posts: 360
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don't know the answer to my own question, but have this same lay out, just 2013 model.
since tanks are in the rear, is it possible that full tanks would add axle weight, but not affect tongue weight?
hope someone knows the answer.
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2013 198RD
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06-06-2018, 10:41 AM
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#4
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Senior Member
Join Date: Sep 2013
Location: South Texas
Posts: 7,207
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Quote:
Originally Posted by lefoster
don't know the answer to my own question, but have this same lay out, just 2013 model.
since tanks are in the rear, is it possible that full tanks would add axle weight, but not affect tongue weight?
hope someone knows the answer.
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Unlikely. If weight is added anywhere other than directly over the axles, there will be a change in tongue weight, it's just a question of magnitude.
For example, if I add 100 lbs 3 feet behind the axles, I might reduce tongue weight by 10 lbs. If I add the same 100 lbs 10 feet behind the axles, I might reduce TW by 60-70 lbs. It all depends on the length of the trailer and the position of the axles in that length.
It is unlikely it will be a pound-for-pound reduction of tongue weight because MOST of our trailers have the axles rear of center, meaning SOME of the added weight behind the axles will always be carried by the axles.
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-2018 Greyhawk 29MV
-2020 Jeep Wrangler Unlimited (JLU) (Primary Toad)
-1994 Jeep Wrangler YJ (Secondary Toad)
-2014 Jay Flight 28BHBE & Ram 2500 6.4L CC 4x4 (sold)
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06-06-2018, 11:04 AM
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#5
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Senior Member
Join Date: Mar 2015
Location: Abingdon
Posts: 6,177
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I've loaded behind the axles of my trailer before and have not really noticed much difference. I attribute that to the WDH, since it distributes weight from the trailers rear bumper to TV front bumper. Could be because of the size, I don't know. But if it's a good hitch and the rig is dialed in, you shouldn't notice much difference.
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2013 Jayco Eagle 328 RLTS
2021 Keystone Montana 3121RL
2013 F350 6.7L 4x4 CCLB
W/Air Lift air bags (front & rear)
Equal-I-Zer™ WDH & B&W Companion
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06-06-2018, 11:06 AM
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#6
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Senior Member
Join Date: Jan 2018
Location: SW
Posts: 513
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Our Jayco Eagle TT has a rear mounted FW tank. I'm guessing the tank is located approx. 4-5 ft. behind the rear-most, rear axle. We have a sealed underbelly so haven't confirmed the exact location yet.
Our tongue weight (loaded) with an empty FW tank is approx. 1,500 lbs. Loaded, with approx. 50-60 gal. in the FW tank (400-480 lbs.) our tongue weight drops approx. 150 - 175 lbs. to approx. 1,325 - 1,350 lbs. We've confirmed these weights several times via CAT scale.
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06-06-2018, 11:28 AM
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#7
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Senior Member
Join Date: Jun 2015
Location: Bay Area
Posts: 765
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Where to get the diagrams with the location of the tanks from? I tow with empty tanks, but I am wondering where the tanks are located on 28DSBH.
Thanks!
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28DSBH (MY2017)
Propride 1400
Solar powered 640W plus 400 Ah lithium batteries
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06-06-2018, 11:31 AM
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#8
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Senior Member
Join Date: Jul 2011
Location: Long Island, NY
Posts: 1,402
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Thirty-eight gallons of water weighs 317 lbs and as others have mentioned, if it's not right over the axle there will be some multiplied impact the further back the tanks are located. Beyond that I'd be concerned about the integrity of the tank mounting as bouncing on the road can turn that 317 lbs into 317 lbs times the upward, downward and sideways force of acceleration.
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2018 Jayco 28RLS
2012 F-250 6.2L 3.73
Equalizer Hitch
Yamaha 2400ISHC
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06-06-2018, 11:38 AM
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#9
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Moderator Emeritus
Join Date: Apr 2011
Location: Michigan
Posts: 9,424
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Quote:
Originally Posted by bono
snip......I am wondering where the tanks are located on 28DSBH. Thanks!
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Contacting Jayco Customer Support would be a start.
Also, I've found that the fresh water tank is usually close to the outside fill port...., or remove the slide motor access cover from the underbelly and with a flashlight you might see the tank (confirmed my tank location this way).
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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06-06-2018, 11:44 AM
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#10
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Senior Member
Join Date: Oct 2014
Location: Sparwood, BC
Posts: 2,800
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Have seen a Trailer loading calculator on the web, but it is several 100 lbs on 500 lbs.
Getting out the bush is no problem, but on the highways I stayed at 50 miles/Hour (80 km/hour. any higher I noticed sway. Mind you there was a 40 km/hour wind.
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2014 Ram 1500 CrewCab 4x4 5.7 Hemi 3.92 Rear and Air Lift 1000
2005 Jayco Jay Feather LGT - 29Y GVWR-7000 lbs.
Dexter Axle Lift 4-9/16" - installed with sub-frame.
Pro Series 1200 lbs. WDH with Double Sway Bar.
Champion 3100/2800 watt Inverter/Generator-Onboard Solar Power
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06-06-2018, 11:58 AM
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#11
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Senior Member
Join Date: May 2012
Location: Minnesota
Posts: 9,740
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I cannot tell you the direct affect on your TT. But my parents last TT, I think it was a 29' SOB. The single FW tank was along the back wall, under their bed. Per my father, they could not tow that TT, with any water in the tank, or it really upset the tongue weight, and he had sway issues.
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