FMS ATLAS 6WD WITH 5th WHEEL AND TANK SEMI TRAILER

Following the Flat bed semi trailer I wanted to get a citern trailer on the FMS ATLAS without compromising the crawling capacity of this fantadtic truck.
Then I found a way to let the 5th wheel move also from side to side.
Capacity is significant the trailer is 410mm long and 115mm width same lenght than for the flat bed.
The 5th wheel is fitted as low as possible on the truck but the semi was to high for me then I cutted a bit the frontsection to get the trailer wheels not so far from the structure.
The trailer structure is very light and glued on the tank using fixtures to locate it properly, see pictures.
Two rear axles are linked together with articulated leaf springs alowing rotation from the midel of the wheels. It is easy to assemble and give nice movement of the axles when offroading.
Trailer has 2 parking feet you can retract and lock when driving.

Assembly is not very difficult, there are 3 main parts for the complete length you have to glue together using internal ring you glue on one side first.

You can assemble first the 3 tank section. Then prepare the under tank rear structure with leaf springs fixtures, it is easier to assemble now.
Then fit on each side of this rear structure one U jig like on pictures. This U Jig have the correct dimention to fit the structure properly when you place the tank upside down flat on the top flat area of the tank. see pictures again.
For the rear U Jig place a scotch band on the U to locate it at the rear end of the tank. It ensure the correct position. When glued and dry you can remove the two U jig which were bolted on the structure.
Then you can add the front section and screw it on the rear section for locating. Glue it and let it dry. 2 feets and lockers can be added there.
The 5th wheel swivel should receive a M3 x 10mm screw. Check with the fith wheel the proper lenght and glue it in the dedicated area on the tank.

As usual you have to redrill holes to 1.2mm when a screw has to screw in and redrill to 1.5mm when a screw has to go through freely. Use M1.4 screws from 4mm to 12mm for the whole assembly.

Tires are Jeep wrangler SCX24 tires with 55mm diameter you can find on Aliexpress and probably ebay too.
They are fitted on dedicated rims which are the same as for swivel trailers.

You can add top covers and rear ladder, you have jigs to locate the 6 top covers properly.

Concerning the 5th wheel, it can rotate in 2 directions which is a good improvement for crawling.
You need a M2x 20mm or any 2mm stud for the lateral rotation.
A locker is made with a M2 x 30mm screw or any 2mm stud. when lock you cannot release the trailer from the truch in any way, unless you remove this stud. I drilled the hole for this stud in the 5th wheel to 2mm then the screw or stud can be fitted and remove easily.
5 the wheel is in 3 parts to get a good sliding surface. The trailer receive a separate part you need to glue on with the side you printed on the bed of the machine in contact with the 5th wheel.
I had a lot of fun making this combo and I hope you will enjoy it too.

In case of any trouble or request please send Email to luc.tellier@wanadoo.fr

videos
https://youtube.com/shorts/2hqZEWYKmVo
https://youtu.be/0QQDSKZNnlc

Nothing special
205°C nozzle, 60°C bed
60mm/s speed