Scamp 5th wheel "bucking" on uneven surface ? - Page 2 - Fiberglass RV


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Old 09-30-2013, 10:28 PM   #15
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Name: Brian
Trailer: Boler (B1700RGH) 1979
Alberta
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Quote:
Originally Posted by Westcliffe01 View Post
I have thought of using a short mount for the leading edge of the spring and a long one for the back, to try to keep the spring movement perpendicular to a line from the axle to the center of the hitch ball.
I see the logic, but I wouldn't do that.

When a beam axle on a leaf spring moves vertically, it also moves forward or backward slightly. When it tilts (because the vehicle is leaning such as in a turn or sway oscillation), the difference between left and right vertical travel causes different fore/aft movement... that means the axle steers. If the front mount of the spring is lower than the rear, it steers into the turn, which is good for stability; that's why trucks have their rear leaf springs noticeably sloped front-down.

Longer mounts on the rear would slope the springs the wrong way for stability. I suspect that just shocks would make a significant difference.
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Old 11-12-2013, 11:29 PM   #16
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Name: Paul
Trailer: '04 Scamp 19D, Tacoma 4.0L 4door, SB
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My take on the bouncing problem is that the tire inflation has a lot to do with it. I towed my 2004 Scamp 19' to Vermont after buying it used in Delaware last February (first time towing anything!). The tires were low and I was not sure about the right pressure, so I pumped them up to 30psi. I was quite worried about the front to back chucking and seeing the trailer bouncing in the rear view mirror. Then I discovered that the right pressure is 45psi (posted on the VIN sticker on the frame). Inflating them to 45psi changed the resonant frequency of the system and made a huge difference in driving comfort. After that I stopped looking into the shock absorbing hitches.
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