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  1. Trailer Ramp Springs
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  3. 6 Foot Wide Trailer
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  5. Dual Ramp Spring
  6. Torsion Spring
Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 160-lb Capacity
M-3 and Associates

Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 160-lb Capacity

Part Number: M346FR
In Stock
$214.93
Trailer Ramp Springs
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Replace your old trailer door spring with this heavy-duty system. This dual-spring setup lets you easily open and close the ramp door on your enclosed trailer and eliminates the risk of it freefalling. Fits 60 to 82 wide trailer doors. Great Prices for the best trailer ramp springs from M-3 and Associates. Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 160-lb Capacity part number M346FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (427)
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  • Videos (1)
  • Photos

M-3 and Associates Trailer Ramp Springs - M346FR

  • 6 Foot Wide Trailer
  • 7 Foot Wide Trailer
  • Dual Ramp Spring
  • Torsion Spring
  • 151 - 185 lbs
  • Conventional Spring
  • 81 Inch Wide Spring
  • 150 Inch Cable
  • M-3 and Associates

Replace your old trailer door spring with this heavy-duty system. This dual-spring setup lets you easily open and close the ramp door on your enclosed trailer and eliminates the risk of it freefalling. Fits 60 to 82 wide trailer doors.


Features:

  • Ramp door spring lets you easily lift and lower the door on your enclosed trailer without risk of injury
    • Helps to take on the weight of your trailer door so you don't have to
  • Dual springs eliminate the risk of the ramp door collapsing and causing damage or injury
    • If one cable falters, the other spring will prevent the trailer door from freefalling
  • Spring reduces wear and helps prevent damage to door hinges
  • System can be modified to fit your specific application
    • Slide the bracket and cable drum down and cut the shaft to a shorter length
  • Yellow safety covers install on top of the bolt heads to prevent any unwanted adjustments
  • Sturdy steel construction
  • Made in the USA


Specs:

  • Application: 60" to 82" wide trailer door
  • Dimensions: 81" wide
  • Spring capacity: 160 lbs
  • Cable length: 150"
  • 1-Year limited warranty


Warning: It is recommended that only individuals who have experience winding torsion springs install this product. If you have not worked with a torsion spring system before, we recommend contacting a local garage door company to install this system.



9500499 M-3 Enclosed Trailer Ramp Conventional Springs - Dual Spring - 160 lbs - 81"

Replaces M-3 9500470





Video of Conventional Ramp Door Spring for 7' Wide Enclosed Trailer - Dual Spring - 160-lb Capacity
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.




Video Transcript for Review of M-3 and Associates Trailer Ramp Springs - Dual Ramp Spring - M346FR

Hi, everyone, Steve here with etrailer.com. Today, we're looking at our Conventional Ramp Door Spring for seven foot wide enclosed trailers. This is a dual-spring, as you can see, and it's got 160 pound capacity rating. Now, folks, if you're not sure, a ramp door spring like this lets you easily lift and lower the door on your enclosed trailer, helping you assist opening and closing to prevent risk of injury. It's gonna help take on the weight of that trailer door, so you don't have to. Now, the dual-spring system here is gonna eliminate the risk of that ramp door collapsing on you really fast, causing damage or injury.

So meaning, if one spring we inchesre to fail, the other spring could potentially hold that up and give you a nice safety net if you will, so it's gonna hold it up and keep the door from free falling. Spring does reduce wear and tear and damage to door hinges. Now, this system, as you can see, is long, it's 81 inches long overall. You can go down to 60 inches if you need to, so you could potentially cut the main bar shorter and slide everything together to give you some more space. Now, looking from the top down, you can see you get the included cables here, you get the safety caps, you get your hardware with brackets, and you get the two side brackets as well.

Now, you slide the bracket and the cable drum down, and you can cut the shaft to a shorter length like I mentioned if you need to. And the safety covers install on top of the bolt heads, preventing any unwanted adjustments. Now, there's a good shot of the ends here with the rollers, that's where the cable's gonna roll up onto. And again, folks, I recommend reading the instructions completely. If you've never done this before, I recommend a garage door professional.

If you can do it yourself, just be super, super careful and safe, these are very dangerous. Make sure you read the instructions at least once, if not twice before you start the installation, just to be sure you know what you're doing before you tackle it. And as always, if you have questions about this or any other ramp spring door or parts, you can reach out to us here at etrailer.com. That's gonna wrap it up. I'm Steven, thanks for watching.

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Customer Satisfaction Score:

Ratings & Reviews

4.6

427 reviews
Review sort icon
Replace your old trailer door spring with this heavy-duty system. This dual-spring setup lets you easily open and close the ramp door on your enclosed trailer and eliminates the risk of it freefalling. Fits 60 to 82 wide trailer doors.

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Was delivered damaged

Mike L. profile picture
Etrailer Expert

Mike L.

10/19/2025

We're sorry that happened, I'll have our Customer Service folks reach out to you.



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was boxed wrong missing pieces

Mike L. profile picture
Etrailer Expert

Mike L.

5/14/2026

I'm sorry that happened Nick! I'll get that taken care of.



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I didn't receive the mounting brackets and mounting hardware and cables

Mike L. profile picture
Etrailer Expert

Mike L.

11/5/2025

Sorry that happened, Timothy! I'll have that taken care of for you!!



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Delivery was quick all parts look great



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Not great the information that I got on this product and what I paid made it sound like it would go in easy for adjustment on the trailer that I had that is not there is a lot of modifications that I have to do

Kate F. profile picture
Etrailer Expert

Kate F.

5/14/2026

I am very sorry to hear that the install is going to be more difficult than you anticipated. I am very curious to know what exactly what part of the description you are referring to?



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So far so good. Easy to install



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Easy to navigate and order… got package on the delivery date on time.



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My lift spring was shipped and delivered in a very timely manner. It was easier than I expected to install with simple instructions and it worked perfectly .



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Broken pieces and missing pieces. Tried emailing them twice with no response


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See what our Experts say about this M-3 and Associates Trailer Ramp Springs

  • Does Dual Ramp Door Spring Turn Each End Independently
    Hey Scott, yes each of the ends of the dual ramp springs like the part # M346FR that you referenced turn independently. How heavy is your tailgate?
    view full answer...
  • How to choose the correct conventional ramp door spring
    Happy to help James, thanks for reaching out! Choosing the right M-3 ramp door spring system really comes down to matching your specific trailer and door. The biggest factor is the weight of your ramp door. The spring system is designed to help lift and control the door, so it needs to be rated for the correct weight. If we don't, then door can feel too heavy or want to spring open too fast. Here's what you want to look at: 1. The width of your ramp door/opening 2. The length of your...
    view full answer...
  • Weight Capacity Options for a 6 ft. Wide Ramp Door Spring
    Thanks for your question, Dale! That’s actually a pretty smart way to use these springs. We do have a couple of higher-capacity options that may work better for a heavier shed door: - Part # M326FR – 6-1/2 ft. long and rated for 150 lbs - Part # M346FR – 7 ft. long, rated for 160 lbs, and uses a dual-spring setup Even though the rods are longer on these two options, they can still be adjusted to fit a 6 ft. wide door, and the rod can be cut down to size if needed. What is the shed door...
    view full answer...


Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Steven C
Installed by:
Steven C
Employee Carrie H
Written by:
Carrie H

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