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I understand the physical difference. Why are torsion better? Looking at trailers and that's an upgrade?
 

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Suspensions wont wear out like it will with springs, shackles and equalizers. 4 Wheel independent suspension. Better Ride. The rubber torsion axles have been the norm on most all of the better trailers since the late 1980s.
 

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We just had our HS band trailer have an axle failure on the way to a championship that was 270 miles away. The thing is a cheap landscaping trailer purchased by a band parent helping with the pit stuff years ago. The rear shackle mount broke. Torsion axles have the mount closer over the line of force from the tire. I wonder if it makes it more reliable than with the spring shackles spread out in addition to the ride quality. They already had a plan and budget to replace it. Hopefully they will continue down that path even though it was fixed.

Here is the tale... We were all on ow way to Syracuse NY for the Field Band Championships when the trailer broke on the NY Thruway around Kingston. Got towed to a company lot by Gallegar towing. The band director showed up with a box truck donated from a moving company. By that time about 10 other parents met up at the yard and by 11:30 we wer loaded up to finish going to Syracuse, another 2-1/2 hours away. We made it, and won a smaller competition on Sat and wine the Championship on Sun. We Aretha only NJ band to make the trip, and beat out 10 others schools to do it. The kids were met by the cops and fire dept. to escort the busses back to the school with all the other kids lined up to meet them too.

And yes torsion axles are withers the upgrade

JT
 

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Leaf springs just bounce down the road and have bushings that wear out. The torsion axles are like a big rubber band inside that twist. They are much smoother on the road for contents. This is why horse and livestock trailers use them. Driving them off curbs or very rough terrain is supposed to be hard on them as they over stress the bands. This is why most construction or trades trailers use leaf springs.
 

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I'd go torsion if it were me. However, with a tandem torsion axle trailer it is easier to overload 1 axle because there is no equalizer between the axles like there is on sprung axles.

If you go torsion, make sure the trailer sits level to avoid overloading 1 axle.
 

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Torsion are much smoother riding and longer lasting/less components to wear.

No way I'd put an expensive racecar suspension/shocks riding on a leaf spring trailer.
99% of the time , this is because the trailer is over-sprung.

Most trailer suppliers don't have a fucken clue about spring rates.
phone one of them and ask what the lb/in rate is for a given spring and they'll reply that they rate them differently.

After spring rate [stiffness], there is also spring load [which is spring shape]

The biggest problem with open car haulers is the variation in weight
They can increase by 500-600% when loaded so it is normally a compromise [and out of the depth of a phone salesman/ parts jockey]

If you go torsion, make sure the trailer sits level to avoid overloading 1 axle.
You can add spacers under one axle to equalize the load [between the frame and mounts]
 

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I'd go torsion if it were me. However, with a tandem torsion axle trailer it is easier to overload 1 axle because there is no equalizer between the axles like there is on sprung axles.

If you go torsion, make sure the trailer sits level to avoid overloading 1 axle.
If the trailer is sitting level as it should be, the axles are loaded the same.

99% of the time , this is because the trailer is over-sprung.

Most trailer suppliers don't have a fucken clue about spring rates.
phone one of them and ask what the lb/in rate is for a given spring and they'll reply that they rate them differently.

After spring rate [stiffness], there is also spring load [which is spring shape]

The biggest problem with open car haulers is the variation in weight
They can increase by 500-600% when loaded so it is normally a compromise [and out of the depth of a phone salesman/ parts jockey]
Agreed, except that leaf springs by themselves with no shock/dampner will still tend to bounce more than a quality torsion.
 

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If the trailer is sitting level as it should be, the axles are loaded the same. ?
Unfortunately the American trend is to add more weight over the tongue [which loads the front axle and unloads the rear axle]
Everything behind the front axle "alligator tails"

Agreed, except that leaf springs by themselves with no shock/dampner will still tend to bounce more than a quality torsion.
Most modern leaf springs have Dacromet coating on the leafs [a controlled friction paint by du-pont]
Dacromet acts like a dampener.

Rubber torsions don't have shocks either.

The biggest advantage of torions is no roll-steer [the wheels don't steer throughout the suspension movement range]
But roll-steer can be designed on tandem leafs to be Roll-understeer which can be self stabilizing.

Many years ago I built a prototype tandem trailer with torsion axles "back to back" [front axle leading and rear axle trailing]
The axles could "float" [or pivoting on their mounts] and were linked together with large tie-rods each side.
This gave me a torsion axle equalizer suspension, and the tie-rod could be used to adjust height.

But the whole exercise was too expensive [for production]

20 years later, the market would accept this now.
 
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