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03-14-2023, 05:05 PM #11
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I think your logic is flawed, when you jack up under the U-bolts, you are supporting the weight of that axle, and the other three axles are supporting their normal weight. So you don't have all the weight on three springs. The only difference is the weight that would be on the tire, is now supported by the jack. Now it would be a different matter if the jack were removed, with no jack stand in place.
IMO Grand Design and all others that I know of recommend against jacking on the axle as a CYA, in case someone jacks in the middle and tries to blame the companies, but saying "They said it was okay to jack on the axles". And using a ramp to lift one tire off the ground, like the Andersen lift ramp, does indeed concentrate all the weight on three axles since one is completely unsupported.Howard and Peggy
2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
His: 1999 Honda Interceptor
Hers: 2013 Spyder ST-S
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03-14-2023, 05:31 PM #12
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If you mean the axle I lift is then transferred to the other 3 locations (spring assemblies), then I don't think that's the case. The jack itself is supporting that tire/spring assembly weight and the other 3 are still the same...essentially. I'm sorry, but if you meant something else, I can't quite follow.Brent & Gina
2018 Ford F250 PSD Crew Cab
SuperGlide 16K Hitch
Grand Design 303 RLS
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03-14-2023, 05:38 PM #13
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Yep, page 2 and Hoopy essentially says same. No blame, no fouls here. I appreciate all thoughts. The trippy thing if you look under the trailer, each spring assembly, on the end of each axle, is supported by about 6-8" of the longest spring where it attaches to the frame. The other 3 of 4 springs are anti-bounce nested springs which adds strength in the middle I suspect. So the weight of the entire trailer is supported on 8 somewhat thin pieces of spring...and it's bouncing down the road! If I were an engineer, I'd never have done that, but I guess they know what they're doing. Look under your RV at the springs. I wonder if it's the arc of the spring or the flexing of all of them that allow those 8 small pieces to not snap. Thoughts on that?
Brent & Gina
2018 Ford F250 PSD Crew Cab
SuperGlide 16K Hitch
Grand Design 303 RLS
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03-14-2023, 06:15 PM #14
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Leaf springs, which is what you're referring to, have been around almost forever. Way back to early horse and buggy days even. Coil springs are a relatively new arrival on the scene compared to leaf springs.
Howard and Peggy
2019 Momentum 351M, and 2018 RAM Cummins dually 6-speed.
His: 1999 Honda Interceptor
Hers: 2013 Spyder ST-S
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03-24-2023, 07:37 AM #15
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03-24-2023, 08:07 AM #16
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John & Kathy
2014 F250 Lariat FX4 6.2L SBCC
2014 Reflection 303RLS
SW Indiana
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03-24-2023, 09:31 AM #17
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03-24-2023, 09:46 AM #18
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Brent & Gina
2018 Ford F250 PSD Crew Cab
SuperGlide 16K Hitch
Grand Design 303 RLS
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03-24-2023, 09:57 AM #19
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Brent & Gina
2018 Ford F250 PSD Crew Cab
SuperGlide 16K Hitch
Grand Design 303 RLS
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03-24-2023, 10:24 AM #20
RV Lock vs Lippert Entry Lock?
Today, 08:22 PM in General Tech Topics