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Old 06-06-2018, 08:19 AM   #1
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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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Old 06-06-2018, 08:51 AM   #2
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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
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Old 06-06-2018, 10:06 AM   #3
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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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Old 06-06-2018, 10:41 AM   #4
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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.
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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Old 06-06-2018, 11:04 AM   #5
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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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Old 06-06-2018, 11:06 AM   #6
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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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Old 06-06-2018, 11:28 AM   #7
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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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Old 06-06-2018, 11:31 AM   #8
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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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Old 06-06-2018, 11:38 AM   #9
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snip......I am wondering where the tanks are located on 28DSBH. Thanks!
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
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Old 06-06-2018, 11:44 AM   #10
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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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Old 06-06-2018, 11:58 AM   #11
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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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