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Old 05-17-2017, 09:12 AM
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Default Add air bags to trailer?

I have an 18' dovetail flatbed trailer. it is mostly used for hauling items to job sites. Also used for hauling cars. I frequently drag the front, back, or both loaded and unloaded. Raising it a few inches would solve most of my problems. It can't be permanent though because the cars I haul are all very low profile and I would start to have issues loading them.

So, has anyone added air bags to a trailer for this purpose?

Thanks,
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Old 05-17-2017, 09:25 AM
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I'm guessing it's a spring suspension now? With electric brakes?

Sounds like it's not the best trailer for both purposes. Either a hinged dovetail that will raise to a flat position, or a tilt bed trailer maybe more what you need.

To add airbags to get the lift you require would mean taking your springs, and mounting them (also guessing this is a tandem axle) to a subframe, which could then be hinged and raised with the airbags.

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Old 05-17-2017, 09:40 AM
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https://www.etrailer.com/Trailer-Sus...SR3500S04.html

Sure looks like a Firestone air bag could get stuffed in there....


Oooooh...better !
https://www.etrailer.com/Trailer-Sus...LC1565391.html

Already made for tandems, replaces the center rocker beam with air.
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Old 05-17-2017, 01:08 PM
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I haven't done it to a trailer but its been done for years with trucks. Take out all the leafs from the pack minus the main, then put a appropriate bag on top of the spring connected to the frame. With the right bag it will ride higher and have the ability to "kneel" for unloading.
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Old 05-17-2017, 01:14 PM
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Here is pretty much what I am talking about...even a trailer!

http://www.performanceboats.com/v-dr...er-bagged.html
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Old 05-17-2017, 05:57 PM
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I don't have anything to add other than an opinion about mono leaf/airbag suspension.

It is ghetto and dangerous.

Without support from the other leafs in the pack there is nothing to prevent axle wrap. Even on a trailer this is important because it can cause brake hop (similar to wheel hop under acceleration)

Also main springs can develop cracks from being over-extended past their range. With relatively short trailer springs this issue is only compounded.

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Old 05-17-2017, 06:32 PM
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Quote:
Originally Posted by Camaro Zach View Post
I don't have anything to add other than an opinion about mono leaf/airbag suspension.

It is ghetto and dangerous.

Without support from the other leafs in the pack there is nothing to prevent axle wrap. Even on a trailer this is important because it can cause brake hop (similar to wheel hop under acceleration)

Also main springs can develop cracks from being over-extended past their range. With relatively short trailer springs this issue is only compounded.

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Makes perfect sense, and a good point.

So the center airbag linkage I posted would help things, as inflation just rolls
the axle around (moving the end attach point) not bending the spring pack
in any way.
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Old 05-17-2017, 07:22 PM
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Interesting write up on the boat trailer. Not really fond of the one axle only use on a tandem though.

I am not looking to give it a lift kit, just get it up an inch or two to prevent dragging for general use and put it back down for loading hot rods.
After reading that I think it may be a workable solution, except without gutting the spring pack, and doing both axles.
Next problem is that I know nothing about air bags, what, where, why, etc. Any advice?
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Old 05-17-2017, 07:32 PM
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Air lift and ride rite both build kits for pickup trucks. Depending on the type of tandem suspension you have you can do what you are trying relatively easily with a bit of thought without bending the springs.
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