Aussie Military Trailer

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Joined
Mar 8, 2017
Threads
7
Messages
51
Location
Australia
This is an Australian military No. 5 1/2 ton trailer.

Over here in Australia you see people making all types of modifications to these - adding RTTs, installing slide-out kitchens and such. Sadly mine is pretty standard.

I was after a 4WD trailer which I could simply use to extend the cargo carry carrying capacity of the BJ40 during an outback trip later this year. No roof top tents or slide-out kitchen for me. In the trailer I want to be able to carry a minimum of six jerrycans (4 x 20l diesel cans and 2 x 22l water cans), spare wheel, a space case, and a big tent. The interior of the trailer has tie-downs which are left over from its military service where each No. 5 trailer was fitted with mounting points for a water bladder.

The trailer is a tub-type like the American M416 with no tailgate. If you lash two empty jerrycans to the drawbar of this trailer you can paddle it in the water like a dinghy. Like most military trailers it is fitted with a lunette ring hitch system.

When I bought it, it was painted camouflage, and since the trailer was built in 1963, I decided to bring it back to its Vietnam-war era look. To do that I needed to give the trailer a complete respray in basic olive drab, then make up a canopy bow and finally source a canvas canopy. This work took a couple of weeks and now it's a good, honest trailer which is perfect for remote outback use.

The only other modification I am making to the trailer is to have an axle made up which will accept the same 6-stud Toyota 16 inch split rims as the tow vehicle. At the moment the trailer is fitted with 5-stud Land Rover wheels. They work fine, but they aren't split rims, which means I can't fix the tyre myself out bush and the Land Rover wheels are quite expensive compared to the dirt-cheap Toyota split rims. I've gotten a quote for the new axle and it's not too bad actually - around A$400 from hub to hub. I'll get this axle made up in May or June.

The tow vehicle has a tow bar with a Hayman Reese style towbar fitted. So far I have tried two different styles of pintle hook on the vehicle. The first type is a solid hayman reese compatible hitch. It works fine, but sits a little too low. The second is a plate to which a separate pintle hook can be bolted. This one gets the trailer's drawbar to the right height, but due to the plate, I can't unlatch the stock spare wheel carrier on the 40 and the tailgate wouldn't open either. Plan C is to remove the Hayman Reese towbar and bolt a pintle hook directly to the factory mount using the four holes.

Here are some pics of the trailer.

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Are they usually spring over?
 
Are they usually spring over?

They are. Straight from the factory. I'm actually thinking of giving this one a spring-under since it's an easily reversible mod and means it will suit my 40 a little better. The 40 has all factory wheels and suspension so no lift fitted or desired.
 
Neat to see your trailer. Always interesting to see what designs are used in other countries!

In these parts split rims are considered dangerous and most street vehicle tire shops won't have anything to do with them.

I've used motorcycle tire irons to change out a 31-10.50R15. Broke the bead using a simple tool that a friend designed, uses whatever long bar you're already carrying for leverage (say the handle from your Hi-Lift/Ranch Jack). This one uses a Snap-on 24" 1/2" drive breaker bar:
i-WNDWzPs.jpg


I doubt that I'd change your mind, but I thought I present the option anyway.
 
Neat to see your trailer. Always interesting to see what designs are used in other countries!

In these parts split rims are considered dangerous and most street vehicle tire shops won't have anything to do with them.

I've used motorcycle tire irons to change out a 31-10.50R15. Broke the bead using a simple tool that a friend designed, uses whatever long bar you're already carrying for leverage (say the handle from your Hi-Lift/Ranch Jack). This one uses a Snap-on 24" 1/2" drive breaker bar:
i-WNDWzPs.jpg


I doubt that I'd change your mind, but I thought I present the option anyway.

That's a pretty cool little gizmo.

Split rims are very common here, since they come fitted as standard to just about all industrial/agricultural landcruisers as well as hiluxes and others. Most owners swap them out for alloy rims or Sunraysias. I've got a second set of AT tyres on 15 inch American racing rims. This means our splitties are dirt cheap and so are second hand 750r16 Dunlop Road Gripper tyres, which I'll end up converting over to for my tow vehicle and trailer. At the moment the Shorty Forty is running Hi-Milers and the trailer has Olympic SteelTrek tyres, both types of tyres are Australian army surplus off the various land rover vehicles..

If I get stuck and can't get the Landcruiser-compatible axle made up in time, then I'll stick with the Land Rover steel rims on the trailer. If a tyre or tube change becomes necessary I'll break the bead with the high lift jack and muddle my way through.
 
I've tried the Hi-Lift method, the little tool works way, way easier. It is another bit to carry around though.....

The round tube sticking out of the rear of your trailer, what is its purpose? Drop a pin to connect a second trailer to the first?
 
I've tried the Hi-Lift method, the little tool works way, way easier. It is another bit to carry around though.....

The round tube sticking out of the rear of your trailer, what is its purpose? Drop a pin to connect a second trailer to the first?

Yep, it's a pintle hook, used to daisy chain multiple trailers behind one vehicle. Mine doesn't have the locking pin, so it's incomplete. Doesn't really matter though, there's no way known that towing a pair of daisychained trailers would be legal hahaha
 
They somehow do that here with the tiny illuminated road work sign trailers, but I'm not sure how the legalities work either. I've seen a std pick-up (for the U.S. anyway) towing 4-5 of them at one time. Us peons don't get to do that......

Looking at the pics again, it looks like the axle is slightly forward of being centered under the box? Usually that makes the loading extremely crucial to how it tows.
 
They somehow do that here with the tiny illuminated road work sign trailers, but I'm not sure how the legalities work either. I've seen a std pick-up (for the U.S. anyway) towing 4-5 of them at one time. Us peons don't get to do that......

Looking at the pics again, it looks like the axle is slightly forward of being centered under the box? Usually that makes the loading extremely crucial to how it tows.

It tows nicely both laden and empty, which is something I hadn't really expected for a trailer with such a short but super heavy drawbar. The Centre of Gravity for the trailer is actually 80mm forward of the axle centre line.
 
Looks a bit like a sankey trailer ... you can see lots of similarities

Nice trailer you got

Is there any data plates on it?
they were based on the British Sankey of the early 1960s. The Kiwis used our trailers too but theres were made in NZ. Mine didn't come with the data plate, just a mod plate showing the various in-service modifications made to it during its 50 years of military service. I do have the blueprints for it somewhere...
 

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