AT's Military Trailer conversion - Defender Source
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  #1  
Old April 30th, 2007, 10:57 PM
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Martyn Davies
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AT's Military Trailer conversion

Scott Lacey, AT's Shop Manager removed the original leaf springs and solid beam axle from an M416 and replaced them with the Adventure Trailers TASS system. The complete job could easily be done in a weekend by one person, although an extra pair of hands would help.

You can read the whole story at:
http://www.atreport.com/shoptalk.html
or at:
http://www.atreport.com/st1.html

Enjoy the story and new website.

Martyn
Adventure Trailers LLC
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  #2  
Old May 1st, 2007, 10:52 AM
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m j
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1200 seems a bit pricey for something like that.... great idea though!!
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  #3  
Old May 1st, 2007, 03:37 PM
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Mike Hammond
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Those dampers seem to be running at a very steep angle, lots of wheel movement for very little damper movement
The trailing arms and air springs look great though
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  #4  
Old May 2nd, 2007, 12:22 AM
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Andrew Walcker
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Pretty much the same suspension that I'm running on my Adventure Trailer Horizon model and can't say enough good things about how well the suspesnion works! Should be a huge improvement over the leaf springs.
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  #5  
Old May 2nd, 2007, 03:24 PM
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Mike Hansen
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I just got done rebuilding the suspension in my M101 Canadian Trailer I built a new axel using Land Rover hubs. Rebuild the springs. Then installed new Gabriel gas charged shocks

Material Cost was about $300(LR axel, 3inch tube steel, Ubolts, spring perches. New shocks... etc). Consumables Cost $75(wire wheels, welding supplies, cut off disks etc). Labor Cost (me) 25 hours in the garage.

The stock springs were completly rusted together and offerd 0 travel. but after rebuilding they are very flexy I derusted with a wire wheel, panted, Waxoyled between the leafs, then reassembled using new hardware.



I will post picks in the near future
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  #6  
Old May 2nd, 2007, 11:40 PM
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Mike Hansen
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Quote:
Originally Posted by mikeslandrover
Those dampers seem to be running at a very steep angle, lots of wheel movement for very little damper movement
The trailing arms and air springs look great though
First I think this is a very trick set up,

Second

Mike is absolutly correct in the fact that there is very little shock movement. If the shock is mounted at 25 degrees (my guess) and the airbag travels 6 inches (A/T web site) the shock travel would be only 2.5 inches. alot of overkill for an OME damper. At 65 degrees from vertical, the shock (damper) would only be 43% effective.

Martyn, not ripping on you or the kick ass trailers you build, just making an observation, on your design.

Good luck

Mike
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  #7  
Old May 4th, 2007, 11:19 PM
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Brian Jenkinson
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Mike I would like to see some pics when you get a chance.

thanks

brian
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  #8  
Old May 5th, 2007, 02:59 AM
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Mike Hammond
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Quote:
Originally Posted by mhansen
First I think this is a very trick set up,

Second

Mike is absolutly correct in the fact that there is very little shock movement. If the shock is mounted at 25 degrees (my guess) and the airbag travels 6 inches (A/T web site) the shock travel would be only 2.5 inches. alot of overkill for an OME damper. At 65 degrees from vertical, the shock (damper) would only be 43% effective.

Martyn, not ripping on you or the kick ass trailers you build, just making an observation, on your design.

Good luck

Mike
Thanks mike, some impirical data from an intuitive observation
I was thinking of building an offroad trailer myself (if I ever finish the 110 rebuild) and was wondering about shock location and travel
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  #9  
Old May 5th, 2007, 11:36 AM
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Mike Hansen
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Quote:
Originally Posted by bjenk
Mike I would like to see some pics when you get a chance.

thanks

brian
So far the trailer is a work in progress. I have the fender frames ready for the Rhino Liner. I am covering the opening in 5 bar aluminum checker plate.

My Plans are to extend the draw bar a bit, and replace the channel draw bars that are stock with rectangular tube.

Here are the pics so far.
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  #10  
Old May 5th, 2007, 05:00 PM
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Mike Hammond
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Mike that is a neat axle.
Rest of the trailer looks good too.

Would I be right in assuming that it's going to have disc brakes and that the track matches the Land Rover? The alloys look good too

I had some ideas floating round involving front radius arms used as trailing arms, coil springs and a panhard rod to keep things in line. I'd get an axle tube fabricated to take LR stub axles with drum brakes hydraulicly operated. Same track as a 90/110.

Mike what wall thickness and OD tube did you use for your axle?
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  #11  
Old May 6th, 2007, 12:43 PM
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Mike Hansen
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Quote:
Originally Posted by mikeslandrover
Mike that is a neat axle.
Rest of the trailer looks good too.

Would I be right in assuming that it's going to have disc brakes and that the track matches the Land Rover? The alloys look good too

I had some ideas floating round involving front radius arms used as trailing arms, coil springs and a panhard rod to keep things in line. I'd get an axle tube fabricated to take LR stub axles with drum brakes hydraulicly operated. Same track as a 90/110.

Mike what wall thickness and OD tube did you use for your axle?
Mike, Thanks the complements.

Is does have the same track width that matches the Defender, about 8 inches more than original. That was one of the reasons that I fabricated fenders for the trailer. I will also be stuffing 285-75-16 tyres under (to match the '90). Lastly the original fenders are light sheet steel, the new angle framed fenders should bounce off of trees and rocks without damaging the trailer.

The trailer is light enough that I do not think I will need brakes to control it. But I do have all the brake hardware for future, if I need it. The trailer originally had a parking brake system that was nice. I have been playing around with some designs to modify the Land Rover calipers to accept a cable pull to activate the brake pads via a cam. This may be a winter project.

I used 3 inch tube steel that was .25 inch wall thickness. It should take a hard rock it without damage.
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  #12  
Old May 6th, 2007, 01:29 PM
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Mike Hammond
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We're limited to 1/2 ton all up weight without brakes over here, admittedly you wouldn't want to tow much more off road.
X eng has a very efficient cable operated caliper that is used for it's dsc hand brake system. I think the calipers are off of some sort of earth moving machinery and are well able to stand up to offroading muck getting thrown at them. worth a thought
In days gone by people used to wrap the leaf springs to prevent rust and grit getting between the leaves kept things super flexy
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  #13  
Old July 21st, 2007, 11:25 AM
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Martyn Davies
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Quote:
Originally Posted by mhansen
First I think this is a very trick set up,

Second

Mike is absolutly correct in the fact that there is very little shock movement. If the shock is mounted at 25 degrees (my guess) and the airbag travels 6 inches (A/T web site) the shock travel would be only 2.5 inches. alot of overkill for an OME damper. At 65 degrees from vertical, the shock (damper) would only be 43% effective.

Martyn, not ripping on you or the kick ass trailers you build, just making an observation, on your design.

Good luck

Mike
There are a few misconceptions here, hopefully I can address them.

The airbag has an inflated height of 6 inches, not a travel height of 6 inches.

The airbag does a few different things. Depending on load it keeps the amount of available travel constant by the user inflating or deflating the bag to the 6" height requirement. Regular suspension looses travel as the trailer is loaded due to suspension sag.

The airbag acts as a shock absorber due to the compression of the air within the bladder.

We are using Rancho 9000 adjustable shocks. They are manufactured to apply more downward pressure to keep the tire on the ground, the air bag is resisting upward movement.

The combination of the shock and airbag provides for an incredible ride over varied terrain. Most of our owners forget they are towing a trailer. Which of course has positive and negative results!

Hope this helps.

Martyn
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