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05-15-2016, 05:49 AM
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#1
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Member
Join Date: May 2016
Location: Franklin
Posts: 94
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Axle Flip Math
Some on the RV.NET forum seem to think if my FW is 5" nose high and I raise the axles by 2" this will not leave me with 3" nose high. They say it will give me more than the 2" as far as leveling the trailer. Is there any truth to this? I have looked all over the internet and can't find anything about this. Does someone have a formula to use to find out?
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05-15-2016, 06:05 AM
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#2
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Senior Member
Join Date: May 2014
Location: North Western West Virginia
Posts: 671
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We looked into it when we got our 25RKS, and talked to an engineer... found out the following: It would void the Jayco warranty, it would void the axle and running gear extended warranties, the center of gravity would be raised, and make the TT dangerously unstable, and decrease the gas mileage (he said because it would be forcing more air under the TT, rather than over it).
All in all, not worth it.
Consult with an engineer... Oh, almost forgot, the insurance company said that they could no longer insure it as it would become a "structurally modified" unit, and it would have to be re-certified as safe.
__________________
The Logan's
2018 Jayco Alante 31v
Me, Dear Wife,
2 Bluetick Hounds
1 Newfoundland
1 Newfoundland / Black Lab Mix
1 Cairn Terrier
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05-15-2016, 06:26 AM
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#3
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Member
Join Date: May 2016
Location: Franklin
Posts: 94
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Double post. Sorry
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05-15-2016, 06:27 AM
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#4
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Member
Join Date: May 2016
Location: Franklin
Posts: 94
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Thanks for the reply, but it doesn't answer my question.
I'm dropping the leaf springs to the lower hole. You can request this be done from the factory.
Will the 2" raise give me more than 2" of leveling?
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05-15-2016, 06:44 AM
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#5
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Senior Member
Join Date: Jun 2010
Location: Saskatoon Sask Canada
Posts: 10,714
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Think lever and fulcrum here... a 2" drop 20' away "should" amount to more at the kingpin
__________________
Seann
2004 Chev Silverado Duramax optioned past the max. 2009 Jayco Eagle 308 RLS 900watts of solar, Lithium batteries (400amp hour), 2000 watt (4000 surge) whole house inverter.
145days boondockinig in2023 2022/151 2021[/COLOR]
93/2020,157/2019219/2018 206/2017,215/2016, 211/2015, 196/14, 247/13, 193/12
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05-15-2016, 06:51 AM
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#6
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Member
Join Date: Mar 2016
Location: Neosho
Posts: 56
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Quote:
Originally Posted by Seann45
Think lever and fulcrum here... a 2" drop 20' away "should" amount to more at the kingpin
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This. The longer the wheelbase the greater the effect. BTW, an axle flip is moving the axles from over to under the springs. Yours are already there.
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05-15-2016, 07:35 AM
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#7
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Member
Join Date: May 2016
Location: Franklin
Posts: 94
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Quote:
Originally Posted by Krusegroup
This. The longer the wheelbase the greater the effect. BTW, an axle flip is moving the axles from over to under the springs. Yours are already there.
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I understand the axle flip thing. It was easier to type in the title. I was typing from a tablet and those things are brutal to type on.
Is there a formula I can use to find out how much it will affect? Can I expect around 2.5" or am I looking at double?
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05-15-2016, 12:51 PM
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#8
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Member
Join Date: Feb 2015
Location: Kansas City
Posts: 54
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__________________
2015 Sierra Denali 3500HD SRW
2015 Jayco 38FLSA - Loaded -
B&W Companion 20K slider hitch
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05-16-2016, 06:30 AM
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#9
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Member
Join Date: Apr 2016
Location: Sparta
Posts: 71
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If you're dropping to the lowest hole in the brackets, it's an easy job. On my last fiver, a 30.5 RLS, I experienced the same thing. When I had the dealer drop them to the lowest hole (I cited safe towing and they did it at no charge), it was still 1.5" nose high but towed so much better.
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Mule: 2016 RAM Mega Cab Dually, 4X4, Demco HiJacker 21K Autoslide on RAM Puck, Laramie, 6.7, Aisin, 4:10's, 51 Gallon Titan fuel tank, Superhitch 30K lb receiver, Jack Rabbit bed cover.
Wagon: 2015 Pinnacle 38FLSA, Sailun G's, Center Point Air Suspension, 572 Watts Solar w/4 T-145s, Solid Step, 1 ton mini split HVAC, Back up cam.
Tote: Custom built swivel wheel tote (one torsion axle w/dual tires) with a Rampage lift.
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05-16-2016, 03:04 PM
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#10
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Senior Member
Join Date: Aug 2013
Location: Missoula, Montana
Posts: 704
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Ours was only slightly nose high, but wanted more wheel skirt clearance so had the dealer do the deed when packing wheel bearings since wheels were going to be off. We are level now. The shop guy called this "jaking". The change to last bolt holes was 2 1/4" higher at axles. The hitch pin doesn't go up too.
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"I might be movin' to Montana soon..."
2020 Outdoors RV Glacier Peak Titanium
2013 Eagle 29.5RKS (traded in)
2013 Ford 6.7L diesel F350
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05-16-2016, 05:40 PM
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#11
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Senior Member
Join Date: Apr 2012
Location: White Bear Lake
Posts: 409
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Umm - can someone explain the lever analogy. Sure, if you are wondering about weight distribution....but the pin is fixed, so if the wheels go up, the nose comes down an equal amount to get closer to level. You aren't moving the fulcrum longer or shorter, just up and down......
__________________
2012 Ford F-150 Eco, SCrew, 4x4, MaxTow, HD Payload
SOB, used to be:Jayco 26.5 RLS
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05-16-2016, 05:47 PM
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#12
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Senior Member
Join Date: Sep 2015
Location: Sioux Falls
Posts: 348
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I have to disagree with some of what your engineer friend said. We have added a sub frame to our trailer and it's nice a leveled now. We took her on a 700-mile round trip a few weeks back and had no issues whatsoever. The trailer did not sway and the center of gravity did not change! Our gas mileage was actually better than before we had her raised. And, the notion that more air would go under the trailer more than the top is silly at best. The air has to hit the TV first, then the trailer. So, our TV's center of gravity has completely changed too? LOL!
Maybe instead of talking to an engineer who (I'm assuming) never towed a trailer, you should speak to a real RV frame shop that has done this mod for a variety of frames, thousand times over? Adding a sub frame is very common for Class A RVs and fifth wheels, and I for one, have not had one iota of an issue with it. Now, I have the peace of mind that both my axles and all four tires will be sharing the load equally, with less risk of tire blowouts and over stressed rear axle!
Quote:
Originally Posted by The Logans
We looked into it when we got our 25RKS, and talked to an engineer... found out the following: It would void the Jayco warranty, it would void the axle and running gear extended warranties, the center of gravity would be raised, and make the TT dangerously unstable, and decrease the gas mileage (he said because it would be forcing more air under the TT, rather than over it).
All in all, not worth it.
Consult with an engineer... Oh, almost forgot, the insurance company said that they could no longer insure it as it would become a "structurally modified" unit, and it would have to be re-certified as safe.
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__________________
U.S. Air Force (1979 to 1994)
2016 Jayco 29.5BHDS
2015 Ram 2500 (6.7L Cummins Diesel)
Queen Creek, Arizona
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05-16-2016, 05:47 PM
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#13
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Member
Join Date: May 2016
Location: Franklin
Posts: 94
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Quote:
Originally Posted by Flapper
Umm - can someone explain the lever analogy. Sure, if you are wondering about weight distribution....but the pin is fixed, so if the wheels go up, the nose comes down an equal amount to get closer to level. You aren't moving the fulcrum longer or shorter, just up and down......
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I don't understand it either, but it's true. My trailer was 5 in nose high. I dropped the leaf springs 2" today and now the trailer is 2" nose high. Raising the leaf springs 2" corrected my out of level by 3".
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05-16-2016, 09:35 PM
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#14
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Senior Member
Join Date: Apr 2016
Location: Boerne
Posts: 174
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Quote:
Originally Posted by The Logans
We looked into it when we got our 25RKS, and talked to an engineer... found out the following: It would void the Jayco warranty, it would void the axle and running gear extended warranties, the center of gravity would be raised, and make the TT dangerously unstable, and decrease the gas mileage (he said because it would be forcing more air under the TT, rather than over it).
All in all, not worth it.
Consult with an engineer... Oh, almost forgot, the insurance company said that they could no longer insure it as it would become a "structurally modified" unit, and it would have to be re-certified as safe.
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CONCUR!!!!!!
Please don't for your safety and others on the road. I have seen a trailer flip after a spring over. I knew him and advised him not to.
__________________
Don
US Army Infantry, my rucksack was my RV
S Texas
'17 Forrest River Cedar Creek Silverback RE
'17 F 350 CC, LB SRW King Ranch
'16 Jayco Eagle HT 27.5 RKDS GONE!
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